Longitudinal Associations of Pubertal Timing and Tempo With Adolescent Mental Health and Risk Behavior Initiation in Urban South Africa

Prediction of body mass index and skeletal maturity for early menarche risk at menarche onset: a cross-sectional study of Chinese girls

BACKGROUND

This study aimed to assess the predictive value of body mass index (BMI) and skeletal maturity for the occurrence of early menarche in Chinese girls.

METHODS

A cross-sectional analysis was conducted on 785 girls aged 8.1-14.6 years who visited our hospital within 3 months of menarche onset. Early menarche was defined as menarche age (MA) <10 years. Skeletal maturity was classified based on the difference between bone age (BA) and chronological age (CA), termed BA-CA; advanced BA was defined as BA-CA>2 years.

RESULTS

The average MA was 10.7 (SD: 1.1) years, with a prevalence of early menarche of 23.3%. BA exhibited relative stability compared with MA, with an average of 12.8 (SD: 0.5) years at menarche onset. At menarche onset, the average height, weight and BMI were 149.1 (SD: 5.1) cm, 43.3 (SD: 7.2) kg and 19.4 (SD: 2.8) kg/m², respectively. Logistic regression analyses indicated that every 1-year increment in BA-CA was independently associated with a 18.90-fold higher risk of early menarche (95% CI 11.77 to 30.32), respectively, and remained statistically significant even after adjusting for height or mid-parental height. Furthermore, the prediction of BA-CA for early menarche demonstrated a dose-dependent pattern across BMI categories, with the greatest risk observed in normal-weight girls, the lowest risk in obese girls and an intermediate risk in overweight girls at the same degree of BA advancement.

CONCLUSIONS

Our findings provide evidence supporting the significant contributions of BMI and skeletal maturity in predicting early menarche among Chinese girls at menarche onset. Additionally, the results suggest a dose-dependent relationship between skeletal maturity and BMI categories, with normal-weight girls displaying a higher risk of early menarche compared to overweight and obese girls with the same degree of BA advancement.

Role of Pubertal Timing and Perceived Parental Attachment in Internalizing Problem Behaviours Among Adolescents

Adolescents need supportive social institutions to help them deal effectively with the demands of pubertal changes accompanied by new social roles, reducing their susceptibility to problem behaviors. Considering this, it will be investigated how internalizing problem behaviors in teenagers is affected by the interaction between pubertal timing and perceived parental attachment. For this, cross-sectional data from 772 adolescents with ages ranging from 11 to 15 years old was used. Regression analyses showed early maturing adolescents with insecure perceived parental attachments had higher levels of depression and anxiety than their early, on-time, and late maturing counterparts with secure perceived parental attachments. This finding supports the contextual amplification model, as the detrimental consequences of early maturation are impacted by difficult parent-adolescent relationships.

Relationship between physical activity and behaviour challenges of adolescents in South Africa

Background

Four out of five adolescents worldwide are physically inactive based on recommended standards.

Aim

We determined whether physical activity is associated with lower behavioural challenges in adolescents to promote buy-in from stakeholders.

Setting

KwaZulu-Natal province, South Africa, from January 2020 to March 2020.

Methods

A cross-sectional study was conducted among 187 adolescent learners (12-18 years) from three government schools in KwaZulu-Natal Province, South Africa, from January to March 2020. We fitted linear regression models between the Strengths and Difficulties Questionnaire scores (total, internalising, externalising, and prosocial) and hours of physical activity exposure, adjusting for demographic covariates, and depression history.

Results

The median age was 14.4 years (interquartile range = 1.36) and 75.9% of the participants were females. Overall average and weekday physical activity were each associated with lower total and externalising but higher pro-social scores. Depression was associated with higher inactivity scores (total, internalising and externalising).

Conclusions

The article shows that physical activity can reduce the behavioural and emotional problems in adolescents.

Contribution

Physical activity is critical for a healthy adolescent hood and needs to be actively included in childhood development.

The association between family adversity and youth mental health outcomes

BACKGROUND

The association between family adversity and young people's mental health outcomes in communities that experience economic instability has not been well explored in the South African context. Furthermore, the overtime interaction between resilience factors, family adversity, and young people's psychological functioning in African settings, like South Africa, is under-investigated.

PURPOSE

This study investigates the relationship between family adversity and conduct problems and depression at two-time points in a sample of youths in two South African communities stressed by their dependency on economically volatile oil and gas industries.

METHOD

This article draws on longitudinal data generated by the Resilient Youth in Stressed Environments (RYSE) study in South Africa, which included 914 and 528 (wave 1 and 3) adolescents and emerging adults (14-27-year-olds; M age = 18.36 years) living in Secunda/eMbalenhle and Sasolburg/Zamdela. Participants were sampled at baseline (wave 1) and 18-24 months later (wave 3). They self-reported experience of community violence, family adversity, resilience-enabling resources, conduct difficulties, and depression symptoms. Regression analyses were used to examine the unadjusted and adjusted association of family adversity on conduct problem and depression.

RESULTS

About 60% of participants reported high family adversity. Regressions, however, revealed no association between family adversity and conduct problems and depression cross-sectionally and over time. Individual resilience, biological sex, and experience of victimization in the community, however, were associated with conduct difficulty while all three resilience factors were associated with decreased depression among participants.

CONCLUSION

Our study sheds light on the risk and protective factors for mental health outcomes of adolescents and youths who reside in volatile, turbulent communities and experience ongoing familial challenges. To effectively support the mental well-being of young individuals in such contexts, interventions must consider the potential ambivalence of the resilience factors they aim to strengthen.

Growth in Infancy and Childhood and Age at Menarche in Five Low- or Middle-Income Countries: Consortium of Health Orientated Research in Transitional Societies (COHORTS)

BACKGROUND

Earlier age at menarche is associated with behavioral and noncommunicable disease risks. The influence of birth weight (BW) (intrauterine) and postnatal growth on age at menarche is not well studied in low- and middle-income countries (LMICs).

OBJECTIVE

Therefore, we investigated these associations in 5 LMIC birth cohorts.

METHODS

We analyzed data from Brazil, Guatemala, India, the Philippines, and South Africa (n = 3983). We derived stunting (< -2 SD scores) at 24 mo using the WHO child growth standards. We generated interaction terms with categorized BW and conditional weight (lighter < 0 or heavier ≥ 0), and height (shorter < 0 or taller ≥ 0) z-scores. We categorized early-, modal-, and late-onset menarche and used multilevel ordinal regression. We used multilevel linear regression on continuous age at menarche.

RESULTS

Mean age at menarche was 12.8 y (95% CI: 12.7 12.9). BW was not associated with age at menarche. Conditional height at 24 mo and mid-childhood (OR: 1.35; 95% CI: 1.27, 1.44 and 1.32; 1.25, 1.41, respectively) and conditional weight at 24 mo and mid-childhood (OR: 1.15; 1.08, 1.22 and 1.18; 1.11, 1.25, respectively) were associated with increased likelihood of early-onset menarche. Being heavier at birth and taller at 24 mo was associated with a 4-mo (95% CI: 0.8, 7.6) earlier age at menarche than being lighter at birth and shorter at 24 mo. Being heavier at birth but lighter in mid-childhood was associated with a 3-mo (95% CI: 0.8, 4.8) later age at menarche than being lighter at birth and mid-childhood. Age at menarche was 7 mo later in stunted than nonstunted girls.

CONCLUSION

Age at menarche is inversely related to relative weight gain but also to rapid linear growth among those born shorter but remained stunted, and those born taller and grew excessively. These findings do not deter the global health goal to reduce growth faltering but emphasize the potential adverse effects of an obesogenic environment on adolescent development.

Early menarche and adult major depressive disorder among Japanese women: The role of childhood traumatic experience and socioeconomic conditions in young adulthood

Aim

The aim of this study is to examine the long-term impact of early menarche with adult depression, and to assess whether this association was explained by childhood traumatic experience and socioeconomic condition in early adulthood.

Methods

The data were derived from World Mental Health Survey Japan Second, a cross-sectional survey conducted among Japanese community residents between 2013 and 2015. We used the data of female respondents aged 20-75 years (N = 1171). Hazard ratio (HR) of the onset of major depression up to 40 years was calculated for an early-menarche group and a non-early-menarche group, respectively. Kaplan-Meier curve and log-rank statistics were used to examine the difference in failure. Cox proportional hazard models were administered for the association of major depression with early-menarche and early-life psychosocial factors.

Results

Risk for major depressive disorders were three to four times higher in an early-menarche group, and the differences in survival functions were significant (p < 0.001). HR of early menarche was 2.79 (95% CI = 1.29-6.02), and was slightly changed when childhood traumatic experience and socioeconomic conditions in young adulthood were added in the model (HR = 2.88, 95% CI = 1.30-6.38; HR = 3.19, 95% CI = 1.41-7.21).

Conclusion

Early menarche was significantly associated with increased risk for depression by the age of 40 years. Childhood trauma and socioeconomic hardship in early adulthood did not account for the association. Both physical and psychosocial risk factors in early life need to be addressed for preventing women's depression.

The effects of puberty and its hormones on subcortical brain development

Puberty triggers a period of structural “re-organization” in the brain, when rising hormone levels act via receptors to influence morphology. However, our understanding of these neuroendocrine processes in humans remains poor. As such, the current longitudinal study characterized development of the human subcortex during puberty, including changes in relation to pubertal (Tanner) stage and hormone (testosterone, dehydroepiandrosterone [DHEA]) levels. Beyond normative group-level patterns of development, we also examined whether individual differences in the rate of pubertal maturation (i.e., “pubertal/hormonal tempo”) were associated with variations in subcortical trajectories. Participants (N = 192; scans = 366) completed up to three waves of MRI assessments between 8.5 and 14.5 years of age. Parents completed questionnaire assessments of pubertal stage at each wave, and adolescents provided hormone samples on a subset of waves. Generalized additive mixture models were used to characterize trajectories of subcortical development. Results showed that development of most subcortical structures was related to pubertal stage, although findings were mostly non-significant when controlling for age. Testosterone and DHEA levels were related to development of the amygdala, hippocampus and pallidum in both sexes, and findings in the amygdala remained significant when controlling for age. Additionally, we found that variability in hormonal (specifically testosterone) tempo was related to right hippocampal development in males, with an accelerated pattern of hippocampal development in those with greater increases in testosterone levels. Overall, our findings suggest prominent hormonal influences on the amygdala and hippocampus, consistent with the prevalence of androgen and estrogen receptors in these regions. We speculate that these findings are most likely reflective of the important role of adrenarcheal processes on adolescent brain development.

There are widespread associations between physical and hormonal indices of puberty and subcortical development.

Effects of testosterone and DHEA are strongest in the amygdala, hippocampus and pallidum.

Individual differences in the tempo of rising testosterone are related to variability in hippocampal development in males.