Adolescence and the next generation

Trajectory of Cardiovascular Health Across Childhood and Adolescence

Importance

The American Heart Association put forth the Life's Essential 8 construct to assess cardiovascular health (CVH) based on 8 behavioral and health factors. Few studies have characterized the natural history of CVH in early life or identified its sociodemographic determinants.

Objective

To characterize CVH trajectories across childhood and adolescence and identify associations with sociodemographic variables.

Design, Setting, and Participants

This study used data from the Project Viva prebirth cohort, an ongoing prospective prebirth cohort study conducted in a large multispecialty group practice in eastern Massachusetts among women who were pregnant and enrolled from April 1999 to November 2002. Participant inclusion required 3 or more CVH metrics in early childhood (median [range] age, 3.2 [2.8-6.2] years) or 4 metrics or more in midchildhood (median [range] age, 7.7 [6.6-10.9] years), early adolescence (median [range] age, 13.0 [11.9-16.6] years), or late adolescence (median [range] age, 17.5 [15.4-20.1] years). Of 2218 live births in the original cohort, 1523 were included in the present analysis. Data were analyzed from June to December 2023.

Exposures

Child sex, race, and ethnicity; maternal education; and household income.

Main Outcomes and Measures

CVH score (0-100 points) from early childhood to late adolescence, calculated as the unweighted average of all available CVH metrics at each life stage.

Results

Among 1523 children, 782 (51.4%) were male; 53 (3.5%) were non-Hispanic Asian, 231 (15.2%) were non-Hispanic Black, 988 (65.0%) were non-Hispanic White, and 175 (11.5%) were non-Hispanic other. The mean (SD) CVH score was 82.6 (8.6) in early childhood, 84.1 (8.3) in midchildhood, 82.0 (9.8) in early adolescence, and 73.8 (11.5) in late adolescence. The estimated mean (SD) age of inflection when CVH score declined was 10.1 (0.7) years for male children and 10.0 (0.6) years for female children; the decline in CVH was associated with health behaviors rather than health factors. Male children (vs female children) had faster CVH score gain before the inflection (β, 0.79 points/year; 95% CI, 0.67 to 0.91) and faster CVH score decline after the inflection (β, -0.33 points/year; 95% CI, -0.44 to -0.22). Non-Hispanic Black children (β, 0.32 years; 95% CI, 0.20 to 0.43) and children of other non-Hispanic races (β, 0.16 years; 95% CI, 0.05 to 0.28) children had later timing of inflection compared with non-Hispanic White children. Children of mothers without (vs with) a college degree or with household income $70 000 per year or less (vs greater than $70 000/year) exhibited lower CVH trajectory throughout childhood. Children of mothers with some college education (vs a college degree) had later timing of inflection (β, 0.16 years; 95% CI, 0.07 to 0.26) and slower CVH score gain before the inflection (β, -0.24 points/year; 95% CI, -0.40 to -0.08).

Conclusions

This study provides insight into the trajectory of CVH early in life, which may contribute to CVH disparities in adulthood, and identified modifiable health behaviors for focused prevention efforts to optimize CVH in early life.

The relationship between non-communicable disease risk and mental wellbeing in adolescence: a cross-sectional study utilising objective measures in Indonesia

BACKGROUND

Risk factors for non-communicable diseases (NCDs, cardiovascular diseases, cancers, chronic respiratory diseases, diabetes, and mental disorders) arise in adolescence but are mostly framed as relevant to health in adulthood; little is known about the relationship between co-occurring NCD risks and mental wellbeing in young people. This study aims to describe the prevalence and co-occurrence of distinct NCD risk factors, and how they relate to current mental wellbeing amongst adolescents in Indonesia, a young and populous country where NCD burden is increasing rapidly.

METHODS

We assessed NCD risk and mental wellbeing amongst 1,331 school-based 16-18-year-olds in Jakarta (N = 609) and South Sulawesi (N = 722). Five domains of NCD risk (adiposity, substance use, physical inactivity, excess sedentary time, and diet) were either measured or self-reported. In Jakarta, we also measured blood glucose, triglycerides, cholesterol, and blood pressure. Wellbeing was assessed using three indicators: general quality of life (QoL), physical function QoL, and psychological distress. We used linear regression to estimate the associations between co-occurring risks and wellbeing, adjusted for covariates of wellbeing: province, sex, socioeconomic status, and religion.

RESULTS

NCD risk clustering was common, and more than half of adolescents had co-occurring risks in 3 or more of the 5 domains (58.9% (95%CI 53.7-63.9)). Adolescents with any NCD risk were more likely to report psychological distress, with this relationship most pronounced in those with excess sedentary time spent on video gaming and computer use. A higher number of NCD risk factors was associated with poorer psychological wellbeing and decreased general and physical function QoL. In the Jakarta subsample, reduced HDL and raised blood glucose was associated with psychological distress; and a higher number of risk biomarkers was associated with lower physical function QoL.

CONCLUSIONS

Our analysis also shows that these NCD risks (both individual risks and co-occurring risk count) are related to poorer profiles of mental wellbeing in adolescents, after adjusting for likely confounders.

National-level and state-level prevalence of overweight and obesity among children, adolescents, and adults in the USA, 1990-2021, and forecasts up to 2050

BACKGROUND

Over the past several decades, the overweight and obesity epidemic in the USA has resulted in a significant health and economic burden. Understanding current trends and future trajectories at both national and state levels is crucial for assessing the success of existing interventions and informing future health policy changes. We estimated the prevalence of overweight and obesity from 1990 to 2021 with forecasts to 2050 for children and adolescents (aged 5-24 years) and adults (aged ≥25 years) at the national level. Additionally, we derived state-specific estimates and projections for older adolescents (aged 15-24 years) and adults for all 50 states and Washington, DC.

METHODS

In this analysis, self-reported and measured anthropometric data were extracted from 134 unique sources, which included all major national surveillance survey data. Adjustments were made to correct for self-reporting bias. For individuals older than 18 years, overweight was defined as having a BMI of 25 kg/m2 to less than 30 kg/m2 and obesity was defined as a BMI of 30 kg/m2 or higher, and for individuals younger than 18 years definitions were based on International Obesity Task Force criteria. Historical trends of overweight and obesity prevalence from 1990 to 2021 were estimated using spatiotemporal Gaussian process regression models. A generalised ensemble modelling approach was then used to derive projected estimates up to 2050, assuming continuation of past trends and patterns. All estimates were calculated by age and sex at the national level, with estimates for older adolescents (aged 15-24 years) and adults aged (≥25 years) also calculated for 50 states and Washington, DC. 95% uncertainty intervals (UIs) were derived from the 2·5th and 97·5th percentiles of the posterior distributions of the respective estimates.

FINDINGS

In 2021, an estimated 15·1 million (95% UI 13·5-16·8) children and young adolescents (aged 5-14 years), 21·4 million (20·2-22·6) older adolescents (aged 15-24 years), and 172 million (169-174) adults (aged ≥25 years) had overweight or obesity in the USA. Texas had the highest age-standardised prevalence of overweight or obesity for male adolescents (aged 15-24 years), at 52·4% (47·4-57·6), whereas Mississippi had the highest for female adolescents (aged 15-24 years), at 63·0% (57·0-68·5). Among adults, the prevalence of overweight or obesity was highest in North Dakota for males, estimated at 80·6% (78·5-82·6), and in Mississippi for females at 79·9% (77·8-81·8). The prevalence of obesity has outpaced the increase in overweight over time, especially among adolescents. Between 1990 and 2021, the percentage change in the age-standardised prevalence of obesity increased by 158·4% (123·9-197·4) among male adolescents and 185·9% (139·4-237·1) among female adolescents (15-24 years). For adults, the percentage change in prevalence of obesity was 123·6% (112·4-136·4) in males and 99·9% (88·8-111·1) in females. Forecast results suggest that if past trends and patterns continue, an additional 3·33 million children and young adolescents (aged 5-14 years), 3·41 million older adolescents (aged 15-24 years), and 41·4 million adults (aged ≥25 years) will have overweight or obesity by 2050. By 2050, the total number of children and adolescents with overweight and obesity will reach 43·1 million (37·2-47·4) and the total number of adults with overweight and obesity will reach 213 million (202-221). In 2050, in most states, a projected one in three adolescents (aged 15-24 years) and two in three adults (≥25 years) will have obesity. Although southern states, such as Oklahoma, Mississippi, Alabama, Arkansas, West Virginia, and Kentucky, are forecast to continue to have a high prevalence of obesity, the highest percentage changes from 2021 are projected in states such as Utah for adolescents and Colorado for adults.

INTERPRETATION

Existing policies have failed to address overweight and obesity. Without major reform, the forecasted trends will be devastating at the individual and population level, and the associated disease burden and economic costs will continue to escalate. Stronger governance is needed to support and implement a multifaceted whole-system approach to disrupt the structural drivers of overweight and obesity at both national and local levels. Although clinical innovations should be leveraged to treat and manage existing obesity equitably, population-level prevention remains central to any intervention strategies, particularly for children and adolescents.

FUNDING

Bill & Melinda Gates Foundation.

Causes and global, regional, and national burdens of traumatic brain injury from 1990 to 2019

PURPOSE

Traumatic brain injury (TBI), currently a major global public health problem, imposes a significant economic burden on society and families. We aimed to quantify and predict the incidence and severity of TBI by analyzing its incidence, prevalence, and years lived with disability (YLDs). The epidemiological changes in TBI from 1990 to 2019 were described and updated to provide a reference for developing prevention, treatment, and incidence-reducing measures for TBI.

METHODS

A secondary analysis was performed on the incidence, prevalence, and YLDs of TBI by sex, age group, and region (n = 21,204 countries and territories) between 1990 and 2019 using the Global Burden of Diseases, Injuries, and Risk Factors Study 2019. Proportions in the age-standardized incidence rate due to underlying causes of TBI and proportions of minor and moderate or severe TBI were also reported.

RESULTS

In 2019, there were 27.16 million (95% uncertainty intervals (UI): 23.36 - 31.42) new cases of TBI worldwide, with age-standardized incidence and prevalence rates of 346 per 100,000 population (95% UI: 298 - 401) and 599 per 100,000 population (95% UI: 573 - 627), respectively. From 1990 to 2019, there were no significant trends in global age-standardized incidence (estimated annual percentage changes: -0.11%, 95% UI: -0.18% - -0.04%) or prevalence (estimated annual percentage changes: 0.01%, 95% UI: -0.04% - 0.06%). TBI caused 7.08 million (95% UI: 5.00 - 9.59) YLDs in 2019, with age-standardized rates of 86.5 per 100,000 population (95% UI: 61.1 - 117.2). In 2019, the countries with higher incidence rates were mainly distributed in Central Europe, Eastern Europe, and Australia. The 2019 global age-standardized incidence rate was higher in males than in females. The 2019 global incidence of moderate and severe TBI was 182.7 per 100,000 population, accounting for 52.8% of all TBI, with falls and road traffic injuries being the main causes in most regions.

CONCLUSIONS

The incidence of moderate and severe TBI was slightly higher in 2019, and TBI still accounts for a significant portion of the global injury burden. The likelihood of moderate to severe TBI and the trend of major injury under each injury cause from 1990 to 2019 and the characteristics of injury mechanisms in each age group are presented, providing a basis for further research on injury causes in each age group and the future establishment of corresponding policies and protective measures.

Global burden of disease attributable to metabolic risk factors in adolescents and young adults aged 15-39, 1990-2021

BACKGROUND

Metabolic risk factors are a significant cause of global burden among adolescents and young adults, but there is a lack of attention to the burden attributable to these metabolic risk factors globally.

AIMS

This study aims to provide comprehensive estimates of five important metabolic risk factors and the attributable disease burden in people aged 15-39 years from 1990 to 2021, based on the Global Burden of Disease Study (GBD) database.

METHODS

Global total deaths and disability-adjusted life years (DALYs) were used to describe the burden attributable to five common metabolic risk factors, including high fasting plasma glucose (FPG), high low-density lipoprotein cholesterol (LDL-C), high systolic blood pressure (SBP), high body mass index (BMI), and kidney dysfunction, in adolescents and young adults. The estimated annual percentage changes (EAPC) of DALYs were utilized to depict the trends from 1990 to 2021.

RESULTS

From 1990 to 2021, the DALY rates attributable to all metabolic risk factors showed a globally significant upward trend, with EAPC reaching 33.0 % (27.4-38.7). Compared to females, males had a heavier burden and a more significant increase in deaths and DALYs attributable to metabolic risk factors. High BMI and high FPG have become the top two metabolic risk factors in 2021, with summary exposure variables (SEV) rising by 84.2 % and 53.6 %, respectively. Low-middle socio-demographic index (SDI), middle SDI, and high SDI regions experienced upward regional trends in DALY rates, while low SDI regions remained stable. Among 204 countries and territories, 101 (49.5 %) showed a significant increase in DALY rates, as indicated by the EAPC.

CONCLUSIONS

There is a substantial global burden attributable to metabolic risk factors in adolescents and young adults in 2021, especially high BMI and high FPG. This calls for further investigation and intervention to address this emerging trend.

Life course predictors of child emotional distress during the COVID-19 pandemic: Findings from a prospective intergenerational cohort study

BACKGROUND

We examine precursors of child emotional distress during the COVID-19 pandemic in a prospective intergenerational Australian cohort study.

METHODS

Parents (N = 549, 60% mothers) of 934 1-9-year-old children completed a COVID-19 specific module in 2020 and/or 2021. Decades prior, a broad range of individual, relational and contextual factors were assessed during parents' own childhood, adolescence and young adulthood (7-8 to 27-28 years old; 1990-2010) and again when their children were 1 year old (2012-2019).

RESULTS

After controlling for pre-pandemic socio-emotional behaviour problems, COVID-19 child emotional distress was associated with a range of pre-pandemic parental life course factors including internalising difficulties, lower conscientiousness, social skills problems, poorer relational health and lower trust and tolerance. Additionally, in the postpartum period, pre-pandemic parental internalising difficulties, lower parental warmth, lower cooperation and fewer behavioural competencies predicted child COVID-19 emotional distress.

CONCLUSIONS

Findings highlight the importance of taking a larger, intergenerational perspective to better equip young populations for future adversities. This involves not only investing in child, adolescent, and young adult emotional and relational health, but also in parents raising young families.

The Future Healthy Countdown 2030 consensus statement: core policy actions and measures to achieve improvements in the health and wellbeing of children, young people and future generations

INTRODUCTION

This consensus statement recommends eight high-level trackable policy actions most likely to significantly improve health and wellbeing for children and young people by 2030. These policy actions include an overarching policy action and span seven interconnected domains that need to be adequately resourced for every young person to thrive: Material basics; Valued, loved and safe; Positive sense of identity and culture; Learning and employment pathways; Healthy; Participating; and Environments and sustainable futures.

MAIN RECOMMENDATIONS

Provide financial support to invest in families with young children and address poverty and material deprivation in the first 2000 days of life. Establish a national investment fund to provide sustained, culturally relevant, maternal and child health and development home visiting services for the first 2000 days of life for all children facing structural disadvantage and/or adversity. Implement a dedicated funding model for Aboriginal and Torres Strait Islander community-controlled early years services across the country to ensure these services are fully resourced to provide quality early learning and integrated services grounded in culture and community. Properly fund public schools, starting by providing full and accountable Schooling Resource Standard funding for all schools, with immediate effect for schools in communities facing structural disadvantage. Establish legislation and regulation to protect children and young people aged under 18 years from the marketing of unhealthy and harmful products. Amend the electoral act to extend the compulsory voting age to 16 years. Legislate an immediate end to all new fossil fuel projects in Australia. Establish a federal Future Generations Commission with legislated powers to protect the interests of future generations.

CHANGES IN APPROACH AS A RESULT OF THIS STATEMENT

Together, these achievable evidence-based policies would significantly improve children and young people's health and wellbeing by 2030, build a strong foundation for future generations, and provide co-benefits for all generations and society.

Mental health issues and the association of mental health literacy among adolescents in urban Ethiopia

BACKGROUND

Epidemiological evidence about the prevalence of adolescent mental health issues and their association with mental health literacy is crucial for sustained mental health promotion strategies. Adolescence is a critical life stage for mental health promotion. However, evidence is not available among Ethiopian school adolescents. Hence, the present study examined the prevalence of adolescents' mental health issues and their correlation with mental health literacy.

MATERIALS AND METHODS

A cross-sectional study was conducted among adolescents (grades 5-12) in Dire Dawa city, Eastern Ethiopia using multistage random sampling. Data was collected using the Strength and Difficulty Questionnaire, WHO-5 well-being index, and mental health literacy questionnaire. SPSS version 25 was used for the descriptive, Chi-square, binary logistic regression, and correlation analyses.

RESULTS

Between 14.0-24.5% of adolescents had reported mental health problems: internalizing problems (14.9-28.8%), emotional problems (10.4-25.5%), and peer relationship problems (17.8-25.5%). These mental health problems were significantly greater among adolescents who had either themselves or their family members used psychoactive substances (p≤0.05). Females from upper elementary (5-8 grade) and lower secondary (9-10) grade levels had a higher prevalence of mental health problems (AOR: 2.60 (0.95-7.10, p<0.05)). The effect of age, parental education, or employment status was insignificant (p>0.05). The prevalence of depression ranged from 18.0-25.5%. Mental health literacy was negatively correlated with total difficulties scores and positively associated with mental well-being scores (p<0.05).

CONCLUSION

The prevalence of adolescents' mental health problems was higher. It implied that promoting mental health literacy could enhance adolescents' positive mental health. Intervention programs should prioritize vulnerable groups and individuals reporting symptoms of mental health difficulties. Future studies should involve qualitative studies and consider effect of other determinants.

Effects of Heat Stress-Induced Sex Hormone Dysregulation on Reproduction and Growth in Male Adolescents and Beneficial Foods

Heat stress due to climate warming can significantly affect the synthesis of sex hormones in male adolescents, which can impair the ability of the hypothalamus to secrete gonadotropin-releasing hormone on the hypothalamic-pituitary-gonadal axis, which leads to a decrease in luteinizing hormone and follicle-stimulating hormone, which ultimately negatively affects spermatogenesis and testosterone synthesis. For optimal spermatogenesis, the testicular temperature should be 2-6 °C lower than body temperature. Heat stress directly affects the testes, damaging them and reducing testosterone synthesis. Additionally, chronic heat stress abnormally increases the level of aromatase in Leydig cells, which increases estradiol synthesis while decreasing testosterone, leading to an imbalance of sex hormones and spermatogenesis failure. Low levels of testosterone in male adolescents lead to delayed puberty and incomplete sexual maturation, negatively affect height growth and bone mineral density, and can lead to a decrease in lean body mass and an increase in fat mass. In order for male adolescents to acquire healthy reproductive capacity, it is recommended to provide sufficient nutrition and energy, avoid exposure to heat stress, and provide foods and supplements to prevent or repair testosterone reduction, germ cell damage, and sperm count reduction caused by heat stress so that they can enter a healthy adulthood.

Temporal changes in the physical fitness of Chinese adolescents aged 13-18 years: an analysis of eight national successive surveys over three decades

Objective

The aim of this study was to assess temporal changes in physical fitness of Chinese adolescents aged 13-18 years from 1985 to 2019.

Methods

Body size /composition and physical fitness indicators, including body height, weight, body mass index (BMI), speed, power, flexibility, muscular endurance, and cardiorespiratory fitness (CRF), were selected from Chinese boys and girls aged 13-18 years from eight Chinese National Surveillance on Students' Constitution and Health from 1985 to 2019. Temporal changes in means were estimated by sample-weighted linear regression at the test × sex × age level, and national trends were estimated by a post-stratification population weighting procedure.

Results

Overall mean body height, weight and BMI increased significantly for Chinese adolescents over 34 years. There was a small improvement for boys in speed (Effect size [ES] = -0.21, 95% confidence interval [CI] = -0.44 ~ 0.02), a small improvement for boys in power (ES = 0.24, 95% CI = -0.20 ~ 0.69), a small improvement for girls in flexibility (ES = 0.45, 95% CI = 0.15 ~ 0.76), a moderate decline for boys (ES = -0.53 95% CI = -0.84 ~ -0.21) and a moderate improvement for girls (ES = 0.61, 95% CI = -0.03 ~ 1.26) in muscular endurance, and large declines in cardiorespiratory fitness (CRF) for boys (ES = 0.93, 95% CI = 0.64 ~ 1.21) and girls (ES = 0.93, 95% CI = 0.58 ~ 1.27) from 1985 to 2019. These trends in each component of fitness were more positive for adolescents aged 13-15 years than that of adolescents aged 16-18 years in both sexes, except for girls in flexibility.

Conclusion

The decline in CRF was most pronounced among Chinese children and adolescents from 1985 to 2019, suggesting a future decline in population health that needs attention.

Reproductive and sexual health literacy and associated factors among late-adolescent high school students in Arba Minch and Sawla towns, Southern Ethiopia, 2023: a cross-sectional study

BACKGROUND

Adequate literacy in reproductive and sexual health is essential for adolescents to obtain, comprehend, evaluate and apply information necessary for making well-informed decisions, as low literacy leads to harmful decision-making, risk-taking and poorer health and self-management. These factors increase the magnitude and severity of problems related to sexuality and reproduction, including unintended pregnancy, HIV/sexually transmitted infections, unsafe abortion and death. However, information regarding the status and affecting factors of literacy in the reproductive and sexual health of adolescents is scarce.

OBJECTIVE

To assess reproductive and sexual health literacy status and associated factors among late-adolescent high school students.

DESIGN

A cross-sectional, institution-based study.

SETTING

The study included eight secondary schools in Arba Minch town (Gamo Zone) and three in Sawla town (Gofa Zone) in the South Ethiopia Region.

METHODS

The study was done between 20 May and 20 June 2023, among late adolescent high school students. Using multistage sampling, 577 students were recruited. Reproductive health literacy was assessed using the Health Literacy Measure for Adolescents tool. Data were loaded into EpiData-V.3.1 and analysed using SPSS-V.25. Binary logistic regression analyses were used to identify associated factors. Variables with a p value <0.25 in bivariable logistic regression were candidates for multivariable logistic regression. A Hosmer-Lemeshow goodness-of-fit statistic was checked and satisfied. Statistical significance was indicated at a p value<0.05.

RESULT

The proportion of students with limited reproductive and sexual health literacy was 69.6% (CI 65.3% to 72.8%). The limited literacy status was significantly associated with school type (public school AOR 0.28 (0.17 to 0.46)), mother's occupation (merchant AOR 0.42 (0.23 to 0.76)), family monthly income (income 10 000-20 000 birr AOR 0.45 (0.22 to 0.95)), having regular physical exercise >30 min (more than once per week, AOR 0.44 (0.23 to 0.84)), and knowledge about condoms (poor AOR 2.23 (1.38 to 3.64)).

CONCLUSION

A notable segment of adolescents exhibited limited reproductive and sexual health literacy. The result emphasises the necessity of all relevant parties to work diligently to guarantee that school adolescents can easily obtain, comprehend, evaluate and use reproductive and sexuality-related information.

Preconception diet in adolescence and its association with hypertensive disorders of pregnancy and preterm birth. Results from the HUNT study

Our aim was to estimate associations of adolescent dietary patterns and meal habits with hypertensive disorders of pregnancy (HDP) and preterm birth. We used data from a prospective cohort study (Norwegian Young-HUNT1) where dietary information was collected during adolescence and pregnancy outcomes were obtained through record linkage to the Norwegian national birth registry. The outcomes were HDP, hypertension, pre-eclampsia/eclampsia, and preterm birth in the first pregnancy and in any pregnancy. Diet was self-reported from validated questionnaires, and exposures were dietary indexes (healthy; unhealthy; fruit and vegetable; fibre index) and meal habits. Recruitment took place in schools. Eligible participants were females aged 13-19 years at the time of dietary assessment with a subsequent singleton pregnancy (n 3622). Women who reported a higher fibre intake in adolescence had a lower risk of pre-eclampsia in the first pregnancy (Relative Risk: 0·84; 95 % CI 0·7, 1·0), although this was weaker in sensitivity analyses. Regular meal habits in mid-adolescence (aged 13-15 years), particularly breakfast and lunch, were weakly associated with a lower risk of hypertension in pregnancy. Our results are the first to indicate an association between aspects of diet and dietary behaviour in mid-adolescence and subsequent HDP. More evidence is needed from larger studies to replicate the results and from alternative study designs to disentangle causality.

Obtaining Consent for Research on Risky Behaviours Among Adolescents in Canada: A Scoping Review

This scoping review explores current practices for obtaining consent in research on risky behaviours among adolescents in Canada. The JBI methodology for scoping reviews was used. The database search was conducted in August 2021 and updated in November 2022. Papers published in 2010 or later were included. Extracted data included study characteristics, sample characteristics, and consent procedures. The review included 83 reports covering 57 studies. Nearly 60% of studies relied on adolescent self-consent for participation. Adolescent self-consent was more common than parental/guardian consent for studies using in-person research methods, older adolescent groups, and particularly vulnerable populations. Parental/guardian consent was more common for studies using younger age groups and general population samples. Adolescent self-consent was more common than parental/guardian consent for most risky behaviours covered by this review. These results provide insight into current consent practices in this area and offer guidance to researchers and institutional review boards in Canada.

Familial confounding of internalising symptoms and obesity in adolescents and young adults; a co-twin analysis

BACKGROUND

Obesity and internalising disorders, including depression and anxiety, often co-occur. There is evidence that familial confounding contributes to the co-occurrence of internalising disorders and obesity in adults. However, its impact on this association among young people is unclear. Our study investigated the extent to which familial factors confound the association between internalising disorders and obesity in adolescents and young adults.

SUBJECTS/METHODS

We used a matched co-twin design to investigate the impact of confounding by familial factors on associations between internalising symptoms and obesity in a sample of 4018 twins aged 16 to 27 years.

RESULTS

High levels of internalising symptoms compared to low levels increased the odds of obesity for the whole cohort (adjusted odds ratio [AOR] = 3.1, 95% confidence interval [CI]: 1.5, 6.8), and in females (AOR = 4.1, 95% CI 1.5, 11.1), but not in males (AOR = 2.8 95% CI 0.8, 10.0). We found evidence that internalising symptoms were associated with an increased between-pair odds of obesity (AOR 6.2, 95% CI 1.7, 22.8), using the paired analysis but not using a within-pair association, which controls for familial confounding. Sex-stratified analyses indicated high internalising symptoms were associated with increased between-pair odds of obesity for females (AOR 12.9, 95% CI 2.2, 76.8), but this attenuated to the null using within-pair analysis. We found no evidence of between or within-pair associations for males and weak evidence that sex modified the association between internalising symptoms and obesity (likelihood ratio test p = 0.051).

CONCLUSIONS

Some familial factors shared by twins confound the association between internalising symptoms and obesity in adolescent and young adult females. Internalising symptoms and obesity were not associated for adolescent and young adult males. Therefore, prevention and treatment efforts should especially address familial shared determinants of obesity, particularly targeted at female adolescents and young adults with internalising symptoms and those with a family history of these disorders.

Personal values, food habits and lifestyles in a sample of adolescents with different adherence to the Mediterranean Diet

BACKGROUND

The aim of this cross-sectional study was to explore the personal values system of an Italian adolescent sample and examine the interrelations of their values with some variables characterizing their lifestyles.

METHODS

A representative sample of 365 adolescents (56.2% females), 15-16 years old from the randomly selected second classes of public/private upper secondary schools of an Italian model region was investigated. The lifestyle of adolescents was explored through a 37-items structured, self-administered questionnaire. Ponderal status was evaluated from measured weight and height. The adherence to the Mediterranean Diet of the sample was determined by the KIDMED Test. The adolescents completed the 21-item Portrait Values Questionnaire, which assesses respondents' endorsement of the ten basic human values.

RESULTS

The results suggest that variables related to their eating habits may be associated with their basic values. Some not healthy eating habits, such as eating while "watching TV"/using PC"/ "studying," were negatively related to tradition, conformity, and security values. The adolescents with both moderate and strong alcohol use, and with smoking habits also showed the highest percentage of low adherence to the Mediterranean Diet.

CONCLUSIONS

Our findings might provide some useful information to support the development of more effective and targeted health promotion interventions approaches tailored for this age group.

Prevalence of the Double Burden of Malnutrition among Adolescents: Associations with Lifestyle Behaviors and Clusters of Social Determinants

The double burden of malnutrition (DBM) is a condition in which malnutrition coexists with overweight, reflecting a new layer of malnutrition. Our objectives were to assess prevalence; test associations between DBM and 24-hour movement behaviors; and investigate whether DBM is associated with clusters of social determinants. Methods: This multicenter cross-sectional study included 1152 adolescents (12 to 17 years old) from four Brazilian cities. Body mass index (BMI, kg/m2) was used to estimate overweight, and the adopted cutoff points took into account the curves established for age and sex: Z-score > 1 and ≤2 (overweight) and Z-score > 2 (obesity). The serum concentration of 25-hydroxyvitamin D [25(OH)D] was stratified into three levels: vitamin D deficiency ≤ 20 ng/mL; vitamin D insufficiency = 21-29 ng/mL; optimal vitamin D ≥ 30 ng/mL. We used multilevel Poisson regression models to estimate prevalence ratios (PRs) and their respective 95% confidence intervals (95%CI) and to analyze the association between DBM and covariates. A significance level of p < 0.05 was considered. Cluster analyses were performed by applying a combination of hierarchical and non-hierarchical methods. Results: A population prevalence of DBM of 7.3% (95% CI: 5.9-8.9) was revealed. A percentage of 19.2% (95% CI: 17.0-21.6) of adolescents were overweight, and 8.3% (95% CI: 6.8-10.1) were obese. A total of 41.5% (95% CI: 38.7-44.4) had vitamin D deficiency, and 25.8% (95% CI: 23.4-28.4) had vitamin D insufficiency. However, 24-hour movement behaviors were not associated with DBM. Adolescents living in the southern region of the country, from public schools whose mothers have higher education, have a 1.94 [PR = 2.94 (95% CI: 1.20-7.23)] times greater chance of developing DBM. These results highlight the importance of specific factors to improve the nutritional health of adolescents, considering the specific social determinants identified in this study.

Health and well-being needs of Indigenous adolescents: a protocol for a scoping review of qualitative studies

INTRODUCTION

Improving the health of Indigenous adolescents is central to addressing the health inequities faced by Indigenous peoples. To achieve this, it is critical to understand what is needed from the perspectives of Indigenous adolescents themselves. There have been many qualitative studies that capture the perspectives of Indigenous young people, but synthesis of these has been limited to date.

METHODS AND ANALYSIS

This scoping review seeks to understand the specific health needs and priorities of Indigenous adolescents aged 10-24 years captured via qualitative studies conducted across Australia, Aotearoa New Zealand, Canada, the USA, Greenland and Sami populations (Norway and Sweden). A team of Indigenous and non-Indigenous researchers from these nations will systematically search PubMed (including the MEDLINE, PubMed Central and Bookshelf databases), CINAHL, Embase, Scopus, the Informit Indigenous and Health Collections, Google Scholar, Arctic Health, the Circumpolar Health Bibliographic Database, Native Health Database, iPortal and NZresearch.org, as well as specific websites and clearinghouses within each nation for qualitative studies. We will limit our search to articles published in any language during the preceding 5 years given that needs may have changed significantly over time. Two independent reviewers will identify relevant articles using a two-step process, with disagreements resolved by a third reviewer and the wider research group. Data will then be extracted from included articles using a standardised form, with descriptive synthesis focussing on key needs and priorities. This scoping review will be conducted and reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews guidelines.

ETHICS AND DISSEMINATION

Ethics approval was not required for this review. Findings will be disseminated via a peer-reviewed journal article and will inform a broader international collaboration for Indigenous adolescent health to develop evidence-based actions and solutions.

Association between BMI and age at menarche or spermarche among both sexes: Findings from six successive national surveys in China

Background

To explore trends of the association between body mass index (BMI) and age at menarche or spermarche and its urban-rural disparities from 1995 to 2019.

Methods

A total of 912 753 children and adolescents - including 519 940 9-18 years old girls and 392 813 11-18 years old boys - were involved in six successive cross-sectional surveys conducted across 30 provinces in China from 1995 to 2019. Data on menarche and spermarche was collected using the status quo method, where same-gender physicians conducted face-to-face interviews to determine if children and adolescents had experienced their first menstrual cycle or ejaculation (yes/no). The median age at menarche or spermarche was estimated by probit analysis. Anthropometric measurements measured the height and weight of the study subjects. Children and adolescents were classified into thinness, normal range of weight, overweight, and obesity. t test was used to compare the differences in BMI between premenarchal and postmenarchal girls or prespermarcheal and postspermarcheal boys. Logistic regression was used to explore the associations between BMI/nutritional status and menarche or spermarche stratified by urban or rural residency status.

Results

From 1995 to 2019, BMI in all age groups growth over time, and the values of BMI among children and adolescents under 15 who had menarche or spermarche were more significant than those without menarche or spermarche. In 2019, for girls, thinness was associated with delayed menarche (odds ratio (OR) = 0.26; 95% confidence interval (CI) = 0.24-0.28), while overweight (OR = 1.99; 95% CI = 1.85-2.14) and obesity (OR = 2.20; 95% CI = 1.92-2.53) was associated with advanced menarche. For boys, thinness was associated with delayed spermarche (OR = 0.71; 95% CI = 0.65-0.78), overweight was associated with advanced spermarche (OR = 1.08; 95% CI = 1.01-1.15) while obesity had no association with spermarche. The OR between BMI and menarche in 1995 was 1.35 (95% CI = 1.33-1.37), which decreased to 1.19 (95% CI = 1.18-1.20) by 2019. The OR between BMI and spermarche in 1995 was 1.10 (95% CI = 1.09-1.11), which decreased to 1.02 (95% CI = 1.02-1.03) by 2019. The trends by urban-rural stratification were consistent with the total sample.

Conclusions

We have established a dose-response relationship between BMI and menarche in girls, whereas the association appears to be nonlinear in boys, and the associations were diminishing. Similar findings were observed in both urban and rural areas. Considering the dual adverse effects of obesity and early puberty on health, the results of this study suggest that sexual health education should be strengthened, especially among obese girls. Further research on the influencing factors and biological mechanisms of early puberty will be beneficial.

Factors associated with healthcare transition readiness for adolescents with chronic conditions: A cross-sectional study

Healthcare transition readiness (HCTR) plays a vital role by fostering autonomy, self-management skills, and active involvement in healthcare, leading to positive health outcomes. This study aimed to examine the factors associated with HCTR in adolescents with chronic conditions (ACCs) including adolescents' autonomy, parental overprotection, and autonomy support from healthcare providers (HCPs). This descriptive study included 107 adolescents aged 14-19 years (median age: 17 years, IQR = 1), recruited from online communities and support groups in South Korea. Data were analyzed using hierarchical linear regression. Our research has shown that HCTR is linked to a lower level of parental overprotection (β = -0.46, 95% CI [-0.59, -0.33]) and higher levels of autonomy support from HCPs (β = 0.46, 95% CI [0.36, 0.56]). Among general characteristics, we also found that having a transfer plan to adult care (β = 0.24, 95% CI [0.04, 0.44]) is significantly associated with HCTR. This study contributes to a broader understanding of HCTR by examining its associated factors in ACC. The results emphasize the pivotal roles of parental involvement, healthcare provider support, and structured transition to adult care in enhancing HCTR. These findings underscore the need for comprehensive assistance to ensure successful healthcare transitions.

Sexual and reproductive health information needs; an inquiry from the lens of in-school adolescents in Ebonyi State, Southeast Nigeria

BACKGROUND

It is important to understand the sexual and reproductive health (SRH) needs of adolescents from the adolescents themselves to address their needs properly. Hence, this paper provides new knowledge on the information needs on SRH among adolescent boys and girls in selected secondary schools in Ebonyi state, southeast Nigeria.

METHOD

A comparative assessment was conducted among adolescent boys and girls in public secondary schools that received a specific school-based SRH intervention (group A) and those that did not receive the intervention (group B). These schools were spread across six urban and rural local government areas in Ebonyi state, southeast Nigeria. A structured interviewer-administered questionnaire was used to collect data from 514 adolescents aged 13 to 18 on their stated needs for SRH information and services. Categorical variables were compared using the Chi-square test, and predictors were determined using logistic regression analysis. The statistical significance was determined at p < 0.05.

RESULT

Majority of the adolescents (82% of intervention group and 92% of non-intervention group) identified puberty and pubertal changes as perceived SRH information need for adolescents (χ2 = 7.94; p-value = 0.01). Adolescents who received SRH intervention have 3.13 (p < 0.001) times the odds of perceiving the need for adolescents to be provided with SRH information than adolescents who did not receive SRH intervention. The odds of perceiving the need for adolescents to be provided with SRH information for adolescents who reside in urban communities are 0.31 (p < 0.001) times the odds for adolescents who resides in rural communities. That is, the perception odds are higher adolescents who reside in rural communities. Multivariate regression of specific SRH information showed the location of residence as a strong predictor of adolescents' perceived need for information on 'puberty and pubertal changes' (OR = 0.30; p = 0.001), 'safe sex and sexual relations' (OR = 0.33; p < 0.001) and 'prevention of pregnancy and use of contraceptives' (OR = 0.28; p < 0.001). Adolescents in senior secondary school have 2.21 (p = 0.002) times the odds of perceiving the need for adolescents to be provided with specific SRH information than adolescents who are in junior secondary school.

CONCLUSION

Adolescents' age, location of residence, and study group were found to be strong predictors of SRH information needs. This suggests the need for in-school adolescents to be provided with substantial and continuous SRH information for healthy living and making informed SRH choices. In developing SRH interventions that will achieve optimal effectiveness in the lives of adolescents in school, different demographic factors should be considered for context-specific and appropriate strategies.

How much do adverse childhood experiences contribute to adolescent anxiety and depression symptoms? Evidence from the longitudinal study of Australian children

This study aims to: (i) examine the association between adverse childhood experiences (ACEs) and elevated anxiety and depressive symptoms in adolescents; and (ii) estimate the burden of anxiety and depressive symptoms attributable to ACEs.Data were analyzed from 3089 children followed between Waves 1 (age 4-5 years) and 7 (16-17 years) of the Longitudinal Study of Australian Children. Logistic regression was used to estimate the associations between ACEs and child-reported elevated anxiety and depressive symptoms at age 16-17. Anxiety and depressive symptoms were measured using the Children's Anxiety Scale and Short Mood and Feelings Questionnaire, respectively. The punaf command available in STATA 14 was used to calculate the population attributable fraction (PAF).Before the age of 18 years, 68.8% of the children had experienced two or more ACEs. In the analysis adjusted for confounding factors, including co-occurring ACEs, both history and current exposure to bullying victimisation and parental psychological distress were associated with a statistically significant increased likelihood of elevated anxiety and depressive symptoms at age 16-17. Overall, 47% of anxiety symptoms (95% CI for PAF: 35-56) and 21% of depressive symptoms (95% CI: 12-29) were attributable to a history of bullying victimisation. Similarly, 17% (95% CI: 11-25%) of anxiety and 15% (95% CI: 4-25%) of depressive symptoms at age 16-17 years were attributable to parental psychological distress experienced between the ages of 4-15 years.The findings demonstrate that intervention to reduce ACEs, especially parental psychological distress and bullying victimisation, may reduce the substantial burden of mental disorders in the population.

Community-based interventions targeting multiple forms of malnutrition among adolescents in low-income and middle-income countries: protocol for a scoping review

BACKGROUND

Adolescent malnutrition is a significant public health challenge in low-income and middle-income countries (LMICs), with long-term consequences for health and development. Community-based interventions have the potential to address multiple forms of malnutrition and improve the health outcomes of adolescents. However, there is a limited understanding of the content, implementation and effectiveness of these interventions. This scoping review aims to synthesise evidence on community-based interventions targeting multiple forms of malnutrition among adolescents in LMICs and describe their effects on nutrition and health.

METHODS AND ANALYSIS

A comprehensive search strategy will be implemented in multiple databases including MEDLINE (through PubMed), Embase, CENTRAL (through Cochrane Library) and grey literature, covering the period from 1 January 2000 to 14 July 2023. We will follow the Participants, Concept and Context model to design the search strategy. The inclusion criteria encompass randomised controlled trials and quasi-experimental studies focusing on adolescents aged 10-19 years. Various types of interventions, such as micronutrient supplementation, nutrition education, feeding interventions, physical activity and community environment interventions, will be considered. Two reviewers will perform data extraction independently, and, where relevant, risk of bias assessment will be conducted using standard Cochrane risk-of-bias tools. We will follow the PRISMA Extension for Scoping Reviews checklist while reporting results.

ETHICS AND DISSEMINATION

The scope of this scoping review is restricted to publicly accessible databases that do not require prior ethical approval for access. The findings of this review will be shared through publications in peer-reviewed journals, and presentations at international and regional conferences and stakeholder meetings in LMICs.

SCOPING REVIEW REGISTRATION

The final protocol was registered prospectively with the Open Science Framework on 19 July 2023 (https://osf.io/t2d78).

A systematic review of evidence on integrated management of psychiatric disorders in youth who use cannabis

Given the risks to mental health associated with cannabis use in youth and the increase in cannabis legalization worldwide and in the U.S., there is a need to understand existing evidence-based approaches to integrated management of psychiatric disorders in youth who use cannabis. This systematic review aimed to appraise the current evidence on integrated treatment for adolescents and young adults with common psychiatric disorders who engage in regular cannabis use. A total of 989 studies were screened for inclusion. Study's titles and abstracts were screened and advanced to full text review for further screening by two independent reviewers. Thirty-five full-text articles were reviewed, with five articles ultimately meeting all criteria for inclusion. Five randomized controlled trials examined the effects of therapeutic interventions in youth with common psychiatric disorders who used cannabis, including two studies on depression, one on bipolar disorder, one on anxiety and one on PTSD were reviewed. No studies were considered high in risk of bias. Overall, there is a paucity of research on the treatment of comorbid adolescent mental health disorders and cannabis use, which limits the ability to draw evidence-based treatment recommendations.

A longitudinal analysis of health inequalities from adolescence to young adulthood and their underlying causes

Research suggests that children of low-educated parents face greater health burdens during the passage from adolescence to young adulthood, as they are more likely to become low-educated themselves, establish behavioural and psychosocial disadvantages, or being exposed to unhealthy working conditions. However, studies examining the development and drivers of health inequalities during this particular life stage are limited in number and have produced varied results. This study investigates trajectories of self-rated health and overweight from 14 to 25 years of age, stratified by parental education, and explores the role of potential mediators (educational achievement, health behaviours, psychosocial factors, working conditions). We rely on prospective cohort data from the National Educational Panel Study (NEPS), a representative sample of 14,981 German ninth graders interviewed yearly from 2011 to 2021 (n = 90,096 person-years). First, we estimated random-effects growth curves for self-rated health and overweight over participants' age and calculated the average marginal effect of high versus low parental education. Second, a series of simulation-based mediation analyses were performed to test how much of health inequalities were explained by children's educational attainment (years of school education, years in university), health behaviours (smoking, alcohol, physical inactivity), psychosocial factors (number of grade repetitions, years in unemployment, chronic stress, self-esteem) and working conditions (physical and psychosocial job demands). We accounted for potential confounding by controlling for age, sex, migration background, residential area, household composition, and interview mode. Results show that higher parental education was related to higher self-rated health and lower probabilities of being overweight. Interaction between parental education and age indicated that, after some equalisation in late adolescence, health inequalities increased in young adulthood. Furthermore, educational attainment, health behaviours, psychosocial factors, and early-career working conditions played a significant role in mediating health inequalities. Of the variables examined, the level of school education and years spent in university were particular strong mediating factors. School education accounted for around one-third of the inequalities in self-rated health and one-fifth of the differences in overweight among individuals. Results support the idea that the transition to adulthood is a sensitive period in life and that early socio-economic adversity increases the likelihood to accumulate health disadvantages in multiple dimensions. In Germany, a country with comparatively low educational mobility, intergenerational continuities in class location seem to play a key role in the explanation of health inequalities in youth.

Lessons learned from talking with adults about nutrition: A qualitative study in the PREPARED project

Improving diet and dietary behaviour of men and women before pregnancy has the potential to benefit both their current and long-term health and the health of their children. Little is known, however, about adults' perception of diet's role in prepregnancy health. This study aimed to explore the state of knowledge and awareness of preconception nutritional health in adults within the fertile age range and what they perceived could motivate healthy eating using the self-determination theory as a theoretical framework. We analysed 33 short exploratory interviews with men (n = 18) and women (n = 15) aged 18-45 years. Participants were grab sampled from three different public locations in the southern part of Norway. Interviews were audio-recorded, transcribed verbatim in 2020 and analysed using a thematic analysis with a semantic approach in 2022. The findings suggest that adults within the fertile age range are not intrinsically motivated to eat healthily, but when they do, it is because eating healthily often aligns with other goals consistent with their values, that is, getting fit or looking good. They possess some basic knowledge of healthy behaviours during pregnancy but are generally unaware of the importance of preconception health and nutrition. There is a need to increase awareness of the impact of preconception health on the health of this and future generations. Improved nutritional education on the significance of diet before conception might facilitate optimal conditions for conceiving and for pregnancy in the adult population within fertile age range.

Strengthening self-regulation and reducing poverty to prevent adolescent depression and anxiety: Rationale, approach and methods of the ALIVE interdisciplinary research collaboration in Colombia, Nepal and South Africa

AIMS

Depression and anxiety are the leading contributors to the global burden of disease among young people, accounting for over a third (34.8%) of years lived with disability. Yet there is limited evidence for interventions that prevent adolescent depression and anxiety in low- and middle-income countries (LMICs), where 90% of adolescents live. This article introduces the 'Improving Adolescent mentaL health by reducing the Impact of poVErty (ALIVE)' study, its conceptual framework, objectives, methods and expected outcomes. The aim of the ALIVE study is to develop and pilot-test an intervention that combines poverty reduction with strengthening self-regulation to prevent depression and anxiety among adolescents living in urban poverty in Colombia, Nepal and South Africa.

METHODS

This aim will be achieved by addressing four objectives: (1) develop a conceptual framework that identifies the causal mechanisms linking poverty, self-regulation and depression and anxiety; (2) develop a multi-component selective prevention intervention targeting self-regulation and poverty among adolescents at high risk of developing depression or anxiety; (3) adapt and validate instruments to measure incidence of depression and anxiety, mediators and implementation parameters of the prevention intervention; and (4) undertake a four-arm pilot cluster randomised controlled trial to assess the feasibility, acceptability and cost of the selective prevention intervention in the three study sites.

RESULTS

The contributions of this study include the active engagement and participation of adolescents in the research process; a focus on the causal mechanisms of the intervention; building an evidence base for prevention interventions in LMICs; and the use of an interdisciplinary approach.

CONCLUSIONS

By developing and evaluating an intervention that addresses multidimensional poverty and self-regulation, ALIVE can make contributions to evidence on the integration of mental health into broader development policy and practice.

A systematic review exploring evidence for adolescent understanding of concepts related to the developmental origins of health and disease

The developmental origins of health and disease (DOHaD) framework has highlighted the importance of the early life period on disease risk in later life with impacts that can span generations. A primary focus to date has been around maternal health and the 'First Thousand Days' as a key developmental window whereby an adverse environment can have lasting impacts on both mother and offspring. More recently, the impact of paternal health has gathered increasing traction as a key window for early life developmental programming. However, to date, adolescents, the next generation of parents, have attracted less attention as a key DOHaD window although many behavioural traits become entrained during adolescence and track into adulthood. This systematic review examined literature focused on identifying adolescent understanding of DOHaD concepts. Consistent across the eligible articles was that overall understanding of DOHaD-related concepts in adolescents was low. Three key themes emerged: 1. Individual-level awareness of DOHaD concepts (cognitive engagement and action of the adolescents themselves); 2. Interpersonal communication and social awareness of DOHaD concepts (cognitive engagement and communication of the DOHaD concepts to family and wider community); and 3. Health literacy and the promotion of adolescence as a key DOHaD life stage. These findings highlight the need to develop strategic approaches to increase DOHaD awareness that are not only appealing to adolescents but can also support sustained changes in health behaviour. Investment in today's adolescents has the potential to act as a NCD 'circuit breaker' and thus will yield significant dividends for future generations.

Development and Promotion of an mHealth App for Adolescents Based on the European Code Against Cancer: Retrospective Cohort Study

BACKGROUND

Mobile health technologies, underpinned by scientific evidence and ethical standards, exhibit considerable promise and potential in actively engaging consumers and patients while also assisting health care providers in delivering cancer prevention and care services. The WASABY mobile app was conceived as an innovative, evidence-based mobile health tool aimed at disseminating age-appropriate messages from the European Code Against Cancer (ECAC) to adolescents across Europe.

OBJECTIVE

This study aims to assess the outcomes of the design, development, and promotion of the WASABY app through a 3-pronged evaluation framework that encompasses data on social media promotion, app store traffic, and user engagement.

METHODS

The WASABY app's content, cocreated with cancer-focused civil society organizations across 6 European countries, drew upon scientific evidence from the ECAC. The app's 10 modules were designed using the health belief model and a gamification conceptual framework characterized by spaced repetition learning techniques, refined through 2 rounds of testing. To evaluate the effectiveness of the app, we conducted a retrospective cohort study using the WASABY app's user database registered from February 4 to June 30, 2021, using a 3-pronged assessment framework: social media promotion, app store traffic, and user engagement. Descriptive statistics and association analyses explored the relationship between sociodemographic variables and user performance analytics.

RESULTS

After extensive promotion on various social media platforms and subsequent traffic to the Apple App and Google Play stores, a sample of 748 users aged between 14 and 19 years was included in the study cohort. The selected sample exhibited a mean age of 16.08 (SD 1.28) years and was characterized by a predominant representation of female users (499/748, 66.7%). Most app users identified themselves as nonsmokers (689/748, 92.1%), reported either no or infrequent alcohol consumption (432/748, 57.8% and 250/748, 33.4%, respectively), and indicated being physically active for 1 to 5 hours per week (505/748, 67.5%). In aggregate, the app's content garnered substantial interest, as evidenced by 40.8% (305/748) of users visiting each of the 10 individual modules. Notably, sex and smoking habits emerged as predictors of app completion rates; specifically, male and smoking users demonstrated a decreased likelihood of successfully completing the app's content (odds ratio 0.878, 95% CI 0.809-0.954 and odds ratio 0.835, 95% CI 0.735-0.949, respectively).

CONCLUSIONS

The development and promotion of the WASABY app presents a valuable case study, illustrating the effective dissemination of evidence-based recommendations on cancer prevention within the ECAC through an innovative mobile app aimed at European adolescents. The data derived from this study provide insightful findings for the implementation of Europe's Beating Cancer Plan, particularly the creation of the EU Mobile App for Cancer Prevention.

Modeling and controlling the body in maladaptive ways: an active inference perspective on non-suicidal self-injury behaviors

A significant number of persons engage in paradoxical behaviors, such as extreme food restriction (up to starvation) and non-suicidal self-injuries, especially during periods of rapid changes, such as adolescence. Here, we contextualize these and related paradoxical behavior within an active inference view of brain functions, which assumes that the brain forms predictive models of bodily variables, emotional experiences, and the embodied self and continuously strives to reduce the uncertainty of such models. We propose that not only in conditions of excessive or prolonged uncertainty, such as in clinical conditions, but also during pivotal periods of developmental transition, paradoxical behaviors might emerge as maladaptive strategies to reduce uncertainty-by "acting on the body"- soliciting salient perceptual and interoceptive sensations, such as pain or excessive levels of hunger. Although such strategies are maladaptive and run against our basic homeostatic imperatives, they might be functional not only to provide some short-term reward (e.g. relief from emotional distress)-as previously proposed-but also to reduce uncertainty and possibly to restore a coherent model of one's bodily experience and the self, affording greater confidence in who we are and what course of actions we should pursue.

Long-term trends and urban-rural disparities in the physical growth of children and adolescents in China: an analysis of five national school surveys over three decades

BACKGROUND

China's rapid economic growth has brought opportunities for improved health and growth of children and adolescents. We sought to explore the long-term trends and urban-rural inequalities in physical growth (specifically height and BMI) among school-aged children and adolescents in China to identify policy priorities for a healthier generation.

METHODS

We used the 1985, 1995, 2005, 2014, and 2019 cycles of the Chinese National Survey on Students' Constitution and Health from primary and secondary schools in 30 mainland provinces, autonomous regions, and municipalities. We analysed height and BMI data for 7, 12, and 18 year old children and adolescents of Han ethnicity. Children and adolescents who had complete data on age, sex, location, weight, and height were included. All surveys used a multi-stage stratified random cluster sampling method and were nationally representative. A univariate kernel density estimation was used to plot the distribution of height and BMI. Quantile regression was used to examine associations between urban and rural locations and the primary outcomes of height and BMI at specific quantiles of distribution (5th, 25th, 50th, 75th, and 95th).

FINDINGS

Across the five surveys (in 1985, 1995, 2005, 2014, and 2019), 313 973 children and adolescents were included. From 1985 to 2019, the height and BMI distribution curves shifted to the right for each age group and sex, with the BMI curve becoming more dispersed. Median height in adolescents aged 18 years increased by 3·8 cm (95% CI 3·4-4·1) in boys in urban areas and 5·7 cm (5·3-6·1) in boys in rural areas, and 2·7 cm (2·4-3·0) in girls in urban areas and 3·7 cm (3·4-4·0) in girls in rural areas. Children in urban areas were taller than those in rural areas at every quantile, but the magnitude of this disparity narrowed by 2019. In 2019, the median height of boys in urban areas were 1·4 cm (1·0-1·8) greater in those aged 7 years, 2·5 cm (1·9-3·1) greater in those aged 12 years, and 1·1 cm (0·6-1·5) greater in those aged 18 years than their rural counterparts, whereas the median height of girls in urban areas were 1·1 cm (0·7-1·4) greater in those aged 7 years, 1·6 cm (1·1-2·1) greater in those aged 12 years, and 1·1 cm (0·7-1·5) greater in those aged 18 years than rural girls. Over this period, urban-rural differences in BMI disappeared at the lowest quantile, but persisted at higher quantiles. In 2019, the urban-rural differences in BMI for boys aged 12 years were 0·6 kg/m2 (95% CI 0·3-0·8) at the median, 1·0 kg/m2 (0·6-1·4) at the 75th quantile, and 0·7 kg/m2 (0·1-1·3) at the 95th quantile; for girls aged 12 years, 0·3 kg/m2 (0·1-0·5) at the median, 0·5 kg/m2 (0·2-0·8) at the 75th quantile, and 0·9 kg/m2 (0·3-1·5) at the 95th quantile; for boys aged 18 years, 0·6 kg/m2 (0·4-0·8) at the median, 0·8 kg/m2 (0·5-1·2) at the 75th quantile, and 0.7 kg/m2 (0·0-1·5) at the 95th quantile; and for girls aged 18 years, 0·2 kg/m2 (0·1-0·4) at the median, 0·5 kg/m2 (0·3-0·8) at the 75th quantile, and 1·0 kg/m2 (0·5-1·5) at the 95th quantile.

INTERPRETATION

Across three decades, school-aged children and adolescents in China have increased in height and BMI, with less disparity between urban and rural locations. Investments are needed to improve the affordability of healthy foods to help children and adolescents in rural areas reach their potential maximum height. Meanwhile, these changes in BMI necessitate tailored strategies according to urban-rural settings to contain the increase in overweight and obesity and promote optimal growth for children and adolescents.

FUNDING

Capital's Funds for Health Improvement and Research, and National Natural Science Foundation of China.

The forgotten girls: the state of evidence for health interventions for pregnant adolescents and their newborns in low-income and middle-income countries

Every year, an estimated 21 million girls aged 15-19 years become pregnant in low-income and middle-income countries (LMICs). Policy responses have focused on reducing the adolescent birth rate whereas efforts to support pregnant adolescents have developed more slowly. We did a systematic review of interventions addressing any health-related outcome for pregnant adolescents and their newborn babies in LMICs and mapped its results to a framework describing high-quality health systems for pregnant adolescents. Although we identified some promising interventions, such as micronutrient supplementation, conditional cash transfers, and well facilitated group care, most studies were at high risk of bias and there were substantial gaps in evidence. These included major gaps in delivery, abortion, and postnatal care, and mental health, violence, and substance misuse-related outcomes. We recommend that the fields of adolescent, maternal, and sexual and reproductive health collaborate to develop more adolescent-inclusive maternal health care and research, and specific interventions for pregnant adolescents. We outline steps to develop high-quality, evidence-based care for the millions of pregnant adolescents and their newborns who currently do not receive this.

Development and Implementation of DIALOG+S in the School Setting as a Tool for Promoting Adolescent Mental Well-Being and Resilience in a Post-Armed Conflict Area in Colombia: Exploratory Cluster Randomized Controlled Trial

BACKGROUND

Educational settings are ideal for promoting mental well-being and resilience in children. The challenges of the COVID-19 pandemic made evident the important role that teachers and school counselors play in the mental health of their students. Therefore, it is imperative to develop and implement cost-effective interventions that allow them to identify and address mental health problems early, especially in post-armed conflict areas, to reduce the burden of mental disorders in this population.

OBJECTIVE

This study aimed to adapt an existing patient-focused digital intervention called DIALOG+ from an adult clinical setting to an adolescent educational setting and to assess the feasibility, acceptability, and estimated effect of implementing this intervention as a tool for promoting quality of life, mental well-being, and resilience.

METHODS

We conducted an exploratory mixed methods study in 2 public schools in postconflict areas in Tolima, Colombia. This study was conducted in 3 phases. In the adaptation phase, focus groups were conducted with students and teachers to identify changes required in DIALOG+ for it to be used in the school setting. The exploration phase consisted of an exploratory cluster randomized controlled trial. A total of 14 clusters, each with 1 teacher and 5 students, were randomly allocated to either the experimental (DIALOG+S) group or to an active control group (counseling as usual). Teachers in both groups delivered the intervention once a month for 6 months. Through screening scales, information was collected on mental health symptoms, quality of life, self-esteem, resilience, and family functionality before and after the intervention. Finally, the consolidation phase explored the experiences of teachers and students with DIALOG+S using focus group discussions.

RESULTS

The changes suggested by participants in the adaptation phase highlighted the central importance of the school setting in the mental health of adolescents. In the exploratory phase, 70 participants with a mean age of 14.69 (SD 2.13) years were included. Changes observed in the screening scale scores of the intervention group suggest that the DIALOG+S intervention has the potential to improve aspects of mental health, especially quality of life, resilience, and emotional symptoms. The consolidation phase showed that stakeholders felt that using this intervention in the school setting was feasible, acceptable, and an enriching experience that generated changes in the perceived mental health and behavior of participants.

CONCLUSIONS

Our results are encouraging and show that the DIALOG+S intervention is feasible and acceptable as a promising opportunity to promote well-being and prevent and identify mental health problems in the school context in a postconflict area in Colombia. Larger, fully powered studies are warranted to properly assess the efficacy and potential impact of the intervention and to refine implementation plans.

TRIAL REGISTRATION

International Standard Randomised Controlled Trial Number (ISRCTN) registry ISRCTN14396374; https://www.isrctn.com/ISRCTN14396374.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID)

RR2-10.2196/40286.

Co-Designing a Farm Safety Gamified Educational Resource With Secondary School Students and Their Teachers: Qualitative Study Protocol

Unintentional injuries are a leading cause of preventable harm among adolescents. Adolescents also experience an increased risk of farm injury, and in Australia, injury-related farm fatalities among adolescents have remained largely unchanged over the past two decades. A third of all incidents involve farm visitors, indicating the need for population-level safety information. This project uses qualitative data to inform a co-design process with adolescents, and their teachers, to develop a game-based farm injury prevention online educational resource. This protocol describes the multi-phase co-design project. Focus group discussions regarding farm injury prevention will be held with students (Year 7 & 8; ∼12–14 years of age) and teachers at high schools with an agricultural focus across two Australian states. Inductive thematic analysis of discussion transcripts, and analysis of farm injury data, will inform the development of the modules and content of the game. User experience testing of the prototype will form the final phase of the project. This process is supported by a Stakeholder Advisory Group, which includes representatives of youth farming organisations, agricultural educators, and national child safety organisations. This group will assist in interpretation and dissemination of findings and promoting the resultant educational resource in schools. Ethical approval has been granted by the University of New South Wales Human Research Ethics Committee. Results will be disseminated through peer-reviewed publications, mass media releases, academic conferences, and the agricultural education sector in Australia via the stakeholder advisory group. This study will provide useful insights into co-designing injury prevention resources for adolescents using gamification and result in a co-designed farm injury prevention educational resource for schools and the general community via mobile and web-based applications.

Addressing the marketing and availability of unhealthy food and beverages in and around selected schools in Ghana: a community readiness appraisal

OBJECTIVE

This study assessed stakeholder readiness to address unhealthy food and beverage marketing and availability in/around Public Basic Schools (for children 4-15 years) in Greater Accra Region, the highly urbanised administrative capital of Ghana.

DESIGN

The community readiness model was used to conduct in-depth mixed methods interviews with stakeholders. Using predefined anchored rating statements, quantitative readiness scores ranging from 1 to 9 were generated. Thematic qualitative analysis was undertaken to understand barriers and facilitators that could influence the implementation of interventions.

SETTING

Greater Accra Region, Ghana.

PARTICIPANTS

18 key informants from various school/education/citizen sectors, which together represented the 'school community' of Greater Accra Region.

RESULTS

The mean readiness scores indicated that the 'school community' was at the 'preplanning' stage of readiness (4.44±0.98) to address the marketing and availability of unhealthy food and beverages in and around schools. The mean readiness score for 'leadership' was the highest of all dimensions (5.36±1.60), corresponding to the 'preparation' stage. The lowest scores were found for 'community knowledge of efforts' (3.19±2.45) and 'resources for efforts' (3.64±0.87), both of which were at a 'vague awareness' stage.

CONCLUSIONS

The 'school community' recognised that the marketing and availability of unhealthy food and beverages was a problem. Additionally, current leadership was actively supportive of continuing/improving efforts that create healthier children's food environments. However, actions that aim to increase the 'school community's' knowledge of existing interventions and securing resources to sustain those interventions are needed before introducing readiness appropriate strategies.

The indirect health impacts of the COVID-19 pandemic on children and adolescents: A review

It is pertinent to examine potentially detrimental impacts of the coronavirus disease 2019 (COVID-19) pandemic on young people. We conducted a review to assess the health impacts of the COVID-19 pandemic on children and adolescents. Databases of MEDLINE, Embase and the Cochrane Library were searched in June 2020, using keywords for 'children', 'adolescents' and 'COVID-19'. English papers discussing young people in context to the COVID-19 pandemic were included. Quality of selected studies was evaluated and scored. Of the 2013 identified articles, 22 met the inclusion criteria, including 11 cohort studies, ten cross-sectional studies and one report. Five main issues emerged: Increased mental health conditions, declines in presentations to paediatric emergency departments, declines in vaccination rates, changes in lifestyle behaviour (mainly decreased physical activity for specific groups of children), and changes in paediatric domestic violence and online child sexual abuse. There are early indications that the COVID-19 pandemic is impacting the health of young people, and this is amplified for those with existing health conditions and vulnerabilities. Despite this, there is limited insight into the protective factors for young people's health and wellbeing, as well as how the impacts of the pandemic can be mitigated in both the short and long term.

Drinking behaviors of Chinese adolescents over the past three decades: A systematic review and meta-analysis

Adolescent drinking is a major worldwide public health challenge. China is home to the world's second largest youth population, but relatively little is known about adolescent drinking behaviors. This study examined (1) prevalence rates and sex and age differences in drinking behaviors among Chinese adolescents over the past three decades and (2) whether underage drinking declined following the enactment of a strict national underage drinking policy in 2006. Literature search was conducted in one Chinese and five English databases following the PRISMA guidelines. A total of 186 studies were included in the meta-analyses using random-effects models on nine measures (Ns range: 13,489-755,796, number of studies range: 12-110): lifetime, past month, past year, and weekly drinking; lifetime, past year, and past month drunkenness; past month binge drinking, and age at first drinking (≤ 13 years). Males reported higher prevalence on all drinking behaviors except for weekly drinking and past month drunkenness. High school students reported higher prevalence in lifetime drinking, past year drunkenness, and lifetime drunkenness, than middle school students. No measured drinking behavior showed a significant or reliable decline after 2006. The findings suggest that prevalence rates of drinking behaviors remain high among Chinese adolescents but are lower than among European or North American adolescents. The 2006 Chinese national policy to reduce underage drinking did not measurably alter patterns of underage drinking. Implications for prevention, research, and policy are discussed.

Non-communicable disease mortality in young people with a history of contact with the youth justice system in Queensland, Australia: a retrospective, population-based cohort study

BACKGROUND

Young people who have had contact with the criminal justice system are at increased risk of early death, especially from injuries. However, deaths due to non-communicable diseases (NCDs) in this population remain poorly described. We aimed to estimate mortality due to NCDs in people with a history of involvement with the youth justice system, compare NCD mortality rates in this population with those in the general population, and characterise demographic and justice-related factors associated with deaths caused by NCDs in people with a history of contact with the youth justice system.

METHODS

In this retrospective, population-based cohort study (the Youth Justice Mortality [YJ-Mort] study), we included all people aged 10-18 years (at baseline) charged with a criminal offence in Queensland, Australia, between June 30, 1993, and July 1, 2014. We probabilistically linked youth justice records with adult correctional records and national death records up to Jan 31, 2017. Indigenous status was ascertained from youth justice and adult correctional records, with individuals identified as Indigenous in either source classified as Indigenous in the final dataset. We estimated crude mortality rates and standardised mortality ratios (SMRs) for comparisons with data from the Australian general population. We identified risk factors for NCD deaths using competing-risks regression.

FINDINGS

Of 48 670 individuals aged 10-18 years (at baseline) charged with a criminal offence in Queensland, Australia, between June 30, 1993, and July 1, 2014, 11 897 (24·4%) individuals were female, 36 773 (75·6%) were male, and 13 250 (27·2%) were identified as identified as Indigenous. The median age at first contact with the youth justice system was 15 years (IQR 14-16), the median follow-up time was 13·4 years (8·4-18·4), and the median age at the end of the study was 28·6 years (23·6-33·6). Of 1431 deaths, 932 (65·1%) had a known and attributed cause, and 121 (13·0%) of these were caused by an NCD. The crude mortality rate from NCDs was 18·5 (95% CI 15·5-22·1) per 100 000 person-years among individuals with a history of involvement with the youth justice system, which was higher than among the age-matched and sex-matched Australian general population (SMR 1·67 [1·39-1·99]). Two or more admissions to adult custody (compared with none; adjusted sub-distribution hazard ratio 2·09 [1·36-3·22]), and up to 52 weeks in adult custody (compared with none; 1·98 [1·18-3·32]) was associated with NCD death.

INTERPRETATION

Young people with a history of contact with the justice system are at increased risk of death from NCDs compared with age-matched and sex-matched peers in the general Australian population. Reducing youth incarceration and providing young people's rights to access clinical, preventive, and restorative services should be a priority.

FUNDING

National Health and Medical Research Council.

Designing High-Fidelity Mobile Health for Depression in Indonesian Adolescents Using Design Science Research: Mixed Method Approaches

BACKGROUND

COVID-19 mitigation protocols, enacted to control the pandemic, have also been shown to have a negative impact on mental health, including the mental health of adolescents. The threat of being infected by SARS-CoV-2 and substantial changes in lifestyle, including limited social interaction due to stay-at-home orders, led to loneliness as well as depressive symptoms. However, offline psychological assistance is restricted, as psychologists are bounded by mitigation protocols. Further, not all adolescents' guardians are open to their children attending or have the means to pay for psychological service; thus, adolescents remain untreated. Having a mobile health (mHealth) app for mental health that uses monitoring, provides social networks, and delivers psychoeducation may provide a solution, especially in countries that have limited health facilities and mental health workers.

OBJECTIVE

This study aimed to design an mHealth app to help prevent and monitor depression in adolescents. The design of this mHealth app was carried out as a high-fidelity prototype.

METHODS

We used a design science research (DSR) methodology with 3 iterations and 8 golden rule guidelines. The first iteration used interviews, and the second and third iterations used mixed method approaches. The DSR stages include the following: (1) identify the problem; (2) define the solution; (3) define the solution objective; (4) develop, demonstrate, and evaluate the solution; and (5) communicate the solution. This study involved students and medical experts.

RESULTS

The first iteration resulted in a wireframe and prototype for the next iteration. The second iteration resulted in a System Usability Scale score of 67.27, indicating a good fit. In the third iteration, the system usefulness, information quality, interface quality, and overall values were 2.416, 2.341, 2.597, and 2.261, respectively, indicating a good design. Key features of this mHealth app include a mood tracker, community, activity target, and meditation, and supporting features that complement the design include education articles and early detection features.

CONCLUSIONS

Our findings provide guidance for health facilities and to design and implement future mHealth apps to help treat adolescent depression.

Epigenomic variability is associated with age-specific naïve CD4 T cell response to activation in infants and adolescents

Childhood is a critical period of immune development. During this time, naïve CD4 (nCD4) T cells undergo programmed cell differentiation, mediated by epigenetic changes, in response to external stimuli leading to a baseline homeostatic state that may determine lifelong disease risk. However, the ontogeny of epigenetic signatures associated with CD4 T cell activation during key developmental periods are yet to be described. We investigated genome-wide DNA methylation (DNAm) changes associated with nCD4 T activation following 72 h culture in media+anti-CD3/CD28 beads in healthy infants (aged 12 months, n = 18) and adolescents (aged 10-15 years, n = 15). We integrated these data with transcriptomic and cytokine profiling from the same samples. nCD4 T cells from both age groups show similar extensive epigenetic reprogramming following activation, with the majority of genes involved in the T cell receptor signaling pathway associated with differential methylation. Additionally, we identified differentially methylated probes showing age-specific responses, that is, responses in only infants or adolescents, including within a cluster of T cell receptor (TCR) genes. These encoded several TCR alpha joining (TRAJ), and TCR alpha variable (TRAV) genes. Cytokine data analysis following stimulation revealed enhanced release of IFN-γ, IL-2 and IL-10, in nCD4 T cells from adolescents compared with infants. Overlapping differential methylation and cytokine responses identified four probes potentially underpinning these age-specific responses. We show that DNAm in nCD4T cells in response to activation is dynamic in infancy and adolescence, with additional evidence for age-specific effects potentially driving variation in cytokine responses between these ages.

Mindfulness-based intervention for clinical and subthreshold perinatal depression and anxiety: A systematic review and meta-analysis of randomized controlled trial

OBJECTIVES

About one in four mothers will experience depression and anxiety during pregnancy and within their first year following childbirth. The meta-analysis aggregated the findings of randomized controlled trials (RCTs) evaluating the immediate post-intervention and maintenance effects of MBI on perinatal depression and anxiety.

METHODS

A systematic search was conducted in PubMed, PsycINFO, Medline, Scopus, and Web of Science for English-language journal articles from the first available date until Oct 27th, 2022.

RESULTS

Twenty-five published RCTs were identified and reviewed, with a total of 2495 perinatal women. MBI was superior to controls for clinical and subthreshold perinatal depression and anxiety. The benefit for depression reduction was stable over time and sustained to the postpartum period, but the maintenance effect on perinatal anxiety was less conclusive. Moreover, MBI's post-intervention effects on depression and anxiety were moderated by perinatal women's symptom severity. The post intervention effects were significantly greater among women in Low- and Middle-Income countries, where perinatal mental health care is less available and accessible. Greater improvement in mindfulness was also associated with a significantly larger post-intervention effect on perinatal depression.

CONCLUSIONS

This meta-analysis suggests that MBIs may complement and extend the available range of effective interventions for clinical and subthreshold perinatal depression and anxiety.

Sleep Deprivation and Insomnia in Adolescence: Implications for Mental Health

Sleep changes significantly throughout the human lifespan. Physiological modifications in sleep regulation, in common with many mammals (especially in the circadian rhythms), predispose adolescents to sleep loss until early adulthood. Adolescents are one-sixth of all human beings and are at high risk for mental diseases (particularly mood disorders) and self-injury. This has been attributed to the incredible number of changes occurring in a limited time window that encompasses rapid biological and psychosocial modifications, which predispose teens to at-risk behaviors. Adolescents’ sleep patterns have been investigated as a biunivocal cause for potential damaging conditions, in which insufficient sleep may be both a cause and a consequence of mental health problems. The recent COVID-19 pandemic in particular has made a detrimental contribution to many adolescents’ mental health and sleep quality. In this review, we aim to summarize the knowledge in the field and to explore implications for adolescents’ (and future adults’) mental and physical health, as well as to outline potential strategies of prevention.

Lower calcium and iron intake in adolescent gymnasts: A case of concern for youth sports nutrition

OBJECTIVES

Diet is important for the appropriate development and maturation of young amateur athletes. The aim of this study was to determine whether young gymnasts were consuming adequate amounts of nutrients, particularly calcium and iron.

METHODS

This cross-sectional survey was conducted in Portugal's Almada and Lisbon regions in 2020. To determine if participants' diet was adequate, weight, height, and skinfold measurements were taken. Dietary consumption was examined using two 24-h recalls. We collected data from 66 participants (60% females, 12-18 y of age), of whom 82% had normal weight and 39% had ideal body fat.

RESULTS

The daily total energy intake (TEI) was1605 ± 601 kcal. Of the TEI, 19%, 31%, and 50% were comprised of protein, fat, and carbohydrates, respectively. The most often consumed protein sources were poultry and ultra-processed meat products (52% and 45%, respectively). The average daily consumption of calcium and iron was 626 ± 293 and 9 ± 3 mg, respectively. Only 2 of the 66 participants had calcium intake within recommended levels, and 1of 5 had iron intake within recommended levels, the percentage of which was lower in girls than boys (7.5% versus 38.5%, P < 0.05).

CONCLUSIONS

Despite having a sufficient macronutrient distribution, Portuguese gymnasts consume a high amount of ultra-processed items and a low amount of calcium and iron. The low proportion of female gymnasts with adequate iron consumption is cause for worry in sports nutrition.