Gender-based research underscores sex differences in biological processes, clinical disorders and pharmacological interventions

Earlier research has presumed that the male and female biology is similar in most organs except the reproductive system, leading to major misconceptions in research interpretations and clinical implications, with serious disorders being overlooked or misdiagnosed. Careful research has now identified sex differences in the cardiovascular, renal, endocrine, gastrointestinal, immune, nervous, and musculoskeletal systems. Also, several cardiovascular, immunological, and neurological disorders have shown differences in prevalence and severity between males and females. Genetic variations in the sex chromosomes have been implicated in several disorders at young age and before puberty. The levels of the gonadal hormones estrogen, progesterone and testosterone and their receptors play a role in the sex differences between adult males and premenopausal women. Hormonal deficiencies and cell senescence have been implicated in differences between postmenopausal and premenopausal women. Specifically, cardiovascular disorders are more common in adult men vs premenopausal women, but the trend is reversed with age with the incidence being greater in postmenopausal women than age-matched men. Gender-specific disorders in females such as polycystic ovary syndrome, hypertension-in-pregnancy and gestational diabetes have attained further research recognition. Other gender-related research areas include menopausal hormone therapy, the "Estrogen Paradox" in pulmonary arterial hypertension being more predominant but less severe in young females, and how testosterone may cause deleterious effects in the kidney while having vasodilator effects in the coronary circulation. This has prompted the National Institutes of Health (NIH) initiative to consider sex as a biological variable in research. The NIH and other funding agencies have provided resources to establish state-of-the-art centers for women health and sex differences in biology and disease in several academic institutions. Scientific societies and journals have taken similar steps to organize specialized conferences and publish special issues on gender-based research. These combined efforts should promote research to enhance our understanding of the sex differences in biological systems beyond just the reproductive system, and provide better guidance and pharmacological tools for the management of various clinical disorders in a gender-specific manner.

Exploring the relationship between drinking preferences and recorded and unrecorded alcohol consumption in Russian regions in 2010-2016

BACKGROUND

In recent years, Russia has seen a decline in alcohol consumption per capita (APC) accompanied by a significant reduction in the share of spirits in total APC. Our aim was to investigate regional variation in alcohol consumption and the association between the share of spirits in APC, and recorded and unrecorded APC.

METHODS

Data on recorded APC were taken from Rosstat. Our estimates on unrecorded APC were based on the guidelines of the Ministry of Health of the Russian Federation and data on alcoholic psychoses and mortality from external causes (546 observations for 78 regions from 2010 to 2016). We estimated fixed effects models with the dependent variables of recorded and unrecorded APC of the population 15+. Independent variables included share of spirits in recorded APC, vodka prices, average income, duration of alcohol sales hours, and others.

RESULTS

During the 2010-2016 period, recorded APC varied by regions from 1.1 to 17.8 litres; unrecorded - from almost zero to 21 litres; the share of spirits in recorded APC - from 20.6% to 89.3%. A 1% increase in the share of spirits was attributed to a 0.2% increase in recorded APC and to a 2.1% increase in unrecorded APC. Various factors were related to regional APC: vodka prices (with elasticity coefficient -0.46 for recorded and 1.67 for unrecorded APC); income (0.23 for recorded and -2.23 for unrecorded APC); duration of sales hours (-0.9 for unrecorded APC); and shares of working age and of urban population.

CONCLUSION

Taking into account a strong correlation between the share of spirits in the recorded APC and consumption of recorded and unrecorded APC, the price of spirits should be increased. In the regions with pronounced preference for spirits, stricter availability restrictions on the alcohol sales are needed, along with strict control of shadow markets.

Using alcohol consumption diary data from an internet intervention for outcome and predictive modeling: a validation and machine learning study

BACKGROUND

Alcohol use disorder (AUD) is highly prevalent and presents a large treatment gap. Self-help internet interventions are an attractive approach to lowering thresholds for seeking help and disseminating evidence-based programs at scale. Internet interventions for AUD however suffer from high attrition and since continuous outcome measurements are uncommon, little is known about trajectories and processes. The current study investigates whether data from a non-mandatory alcohol consumption diary, common in internet interventions for AUD, approximates drinks reported at follow-up, and whether data from the first half of the intervention predict treatment success.

METHODS

N = 607 participants enrolled in a trial of online self-help for AUD, made an entry in the non-mandatory consumption diary (total of 9117 entries), and completed the follow-up assessment. Using multiple regression and a subset of calendar data overlapping with the follow-up, scaling factors were derived to account for missing entries per participant and week. Generalized estimating equations with an inverse time predictor were then used to calculate point-estimates of drinks per week at follow-up, the confidence intervals of which were compared to that from the measurement at follow-up. Next, calendar data form the first half of the intervention were retained and summary functions used to create 18 predictors for random forest machine learning models, the classification accuracies of which were ultimately estimated using nested cross-validation.

RESULTS

While the raw calendar data substantially underestimated drinks reported at follow-up, the confidence interval of the trajectory-derived point-estimate from the adjusted data overlapped with the confidence interval of drinks reported at follow-up. Machine learning models achieved prediction accuracies of 64% (predicting non-hazardous drinking) and 48% (predicting AUD severity decrease), in both cases with higher sensitivity than specificity.

CONCLUSIONS

Data from a non-mandatory alcohol consumption diary, adjusted for missing entries, approximates follow-up data at a group level, suggesting that such data can be used to reveal trajectories and processes during treatment and possibly be used to impute missing follow-up data. At an individual level, however, calendar data from the first half of the intervention did not have high predictive accuracy, presumable due to a high rate of missing data and unclear missing mechanisms.

The contribution of drinking culture at comprehensive school to heavy episodic drinking from adolescence to midlife

BACKGROUND

The school context is associated with adolescent alcohol use, but it is not clear whether this association continues into adulthood. This study examined whether exposure to drunkenness oriented drinking culture in 9th grade school class is associated with individuals' heavy episodic drinking (HED) from adolescence to midlife.

METHODS

Participants in the 'Northern Swedish Cohort' study aged 16 years in 1981 were followed-up when aged 18, 21, 30 and 43 (N = 1080). Individual-level factors were HED, positive attitudes towards drunkenness, early initiation of HED and peer-oriented spare-time. School class-level drinking culture was measured as classmate reported HED, positive attitudes, early initiation of HED and peer-oriented spare time. Multilevel log-binomial regression analyses were adjusted for gender, parental socioeconomic background, family structure and HED at age 16.

RESULTS

After adjustment for sociodemographic factors several cross-sectional and longitudinal associations were found between class-level indicators of drinking culture and individual HED. After additional adjustment for age 16 HED, most associations attenuated. The risk ratio (95% confidence interval) for engaging in HED at age 43 was 1.58 (1.03-2.42) times higher for those who at age 16 had many classmates reporting positive attitude towards drunkenness.

CONCLUSIONS

These findings suggest that drinking culture in school may have a long-lasting impact on drinking habits in adulthood. The associations with HED at follow-ups are likely mediated by HED in adolescence. Studies on alcohol use would benefit from taking into account both individual and contextual factors in a life course perspective.

Geographical variations in the incidence of oesophageal cancer in Sweden

Background: Geographical variations in the incidence and tumour stage distribution of oesophageal cancer in Sweden are not well characterised.Methods: Using data from the Swedish Cancer Registry over 45 years (1972-2016), we compared the age-standardised incidence rates of oesophageal cancer by histological type across all seven national areas (in five-year periods) and 21 counties (in 15-year periods) in Sweden, and assessed the geographical distribution of tumour stage at diagnosis since 2004.Results: The incidence rate of oesophageal adenocarcinoma increased in all national areas and counties and in both sexes over time, while the rate of oesophageal squamous cell carcinoma decreased from the 1980s onwards. In the latest period (2012- 2016), the incidence rate of adenocarcinoma in men ranged from 3.5/100,000 person-years in West Sweden to 6.2/100,000 person-years in North Middle Sweden. At the county level, the rate of adenocarcinoma in men was lowest in Jämtland (2.7/100,000 person-years) and highest in Gotland (6.2/100 000 person-years) in 2002-2016. The incidence rates of both adenocarcinoma and squamous cell carcinoma in women were below 2/100,000 person-years in all national areas and counties in the latest calendar periods, i.e., 2012-2016 and 2002-2016, respectively. The proportion of patents with tumour stage IV ranged from 22% in Stockholm area to 31% in Middle Norrland, while at the healthcare region level it was lowest in Stockholm healthcare region (23%) and highest in North (30%) and Uppsala-Örebro (29%) healthcare regions.Conclusion: There are considerable geographical variations in the incidence and tumour stage distribution of oesophageal cancer in Sweden.

A Multilevel Analysis of Regional and Gender Differences in the Drinking Behavior of 23 Countries

Introduction: Drinking behavior differs not only among countries, but also among regions within a country. However, the extent of such variation and the interplay between gender and regional differences in drinking have not been explored and are addressed in this study. Methods: Data stem from 105,061 individuals from 23 countries of the GENACIS data set. The outcomes were heavy drinking (10/20 g or more of pure ethanol per day for women/men), and risky single occasion drinking (RSOD) (5+ drinks per occasion) at least monthly. Analyses used binary logistic mixed models. Variance at specific levels was measured by the intra-class correlation coefficient (ICC). Gender differences in outcomes were measured using gender ratios. Results: Country-level ICC was 0.13 (95% CI: 0.09-0.18) for heavy drinking and 0.16 (95% CI: 0.10-0.26) for RSOD. Within-country regional-level ICC for heavy drinking and RSOD was 0.02 (95% CI: 0.009-0.05; 0.01-0.04, respectively), implying that 2% of variation in heavy drinking and RSOD was explained by regional variation. Variance in drinking indicators was larger for women compared to men across countries. Gender ratios were higher in low- and middle-income countries. Conclusions: Regional variations in risky drinking were more often present in low- to middle-income countries as well as in a few higher-income countries, and could be due to cultural and demographic differences. Variations in gender differences were larger on the country level than on the regional level, with lower-income countries showing larger differences. These results can help to better identify specific high-risk groups for prevention strategies.

Not in education, employment, or training (NEET) and risk of alcohol use disorder: a nationwide register-linkage study with 485 839 Swedish youths

OBJECTIVE

To investigate to what extent being outside education, employment or training after completed secondary education in Sweden might affect the risk of subsequent alcohol use disorders (AUDs), with sociodemographic indicators, such as sex, domicile and origin, taken into account.

DESIGN

Population register-based cohort study with 485 839 Swedish youths.

SETTING

Sweden.

PARTICIPANTS

All youths who were born between 1982 and 1991 and were aged between 19 and 24 years when they completed secondary education in Sweden, between 2005 and 2009.

PRIMARY OUTCOME MEASURE

Cox regression models were used to estimate the HR of first record of entry into alcohol-related medical care with a diagnosis of an AUD, by level of labour market attachment, from 1 January 2009 to 31 December 2016.

RESULTS

About 4% of the youth population were outside education, employment or training and 25% were in insecure workforce after they completed secondary education. The risk of AUD was higher among youths in insecure workforce, HR 1.40 (95% CI 1.30 to 1.50), and among those outside education, employment or training, HR 1.30 (95% CI 1.11 to 1.51), compared with youths within the core workforce, also after adjusting for age, domicile, sex and origin. Being in education was associated with lower HR of AUD, HR=0.84 (95% CI 0.78 to 0.90).

CONCLUSION

Youths who are in insecure workforce and outside education, employment or training are at higher risk of AUD. Targeted policy actions are needed to support a successful school-work transition to secure equal opportunities for young people.

Integrating Addiction and Mental Health Treatment within a National Addiction Treatment System: Using Multiple Statistical Methods to Analyze Client and Interviewer Assessment of Co-Occurring Mental Health Problems

Aims

For a Swedish national sample of 12,833 individuals assessed for a substance use disorder (SUD) (2002-2008) in the Swedish welfare system, client self-report and clinical staff Addiction Severity Index (ASI) assessment data were used to assess mental health problem severity and needs.

Methods

Analysis of client self-report data using regression methods identified demographic characteristics associated with reporting significant mental health problems. Clinical staff assessment data from the ASI Interviewer Severity Rating (ISR) score were used to develop a K-means cluster analysis with three client cluster profiles: Narcotics (n=4795); Alcohol (n=4380); and Alcohol and Psychiatric Problems (n=3658). Chi-square and one-way ANOVA analyses identified self-reported mental health problems for these clusters.

Results

44% of clients had a history of using outpatient mental health treatment, 45% reported current mental health symptoms, and 19% reported significant mental health problems. Women were 1.6 times more likely to report significant mental health problems than men. Staff assessed that 74.8% of clients had current mental health problems and that 13.9% had significant mental health problems. Client and staff results were congruent in identifying that clients in the Alcohol profile were less likely (5%) to report having significant mental health problems compared to the other two profiles (30% each).

Conclusions

About 19% of clients with SUDs reported significant mental health problems, need integrated addiction and mental health treatment, and these clients are clustered in two population groups. An additional 25% of the addiction treatment population report current mental health symptoms and have at some point used mental health treatment. This national level assessment of the extent and severity of co-occurring disorders can inform decisions made regarding policy shifts towards an integrated system and the needs of clients with co-occurring disorders.

The use of alcohol use disorders identification test (AUDIT) in detecting alcohol use disorder and risk drinking in the general population: validation of AUDIT using schedules for clinical assessment in neuropsychiatry

BACKGROUND

The alcohol use disorders identification test (AUDIT) and AUDIT-Consumption (AUDIT-C) are commonly used in population surveys but there are few validations studies in the general population. Validity should be estimated in samples close to the targeted population and setting. This study aims to validate AUDIT and AUDIT-C in a general population sample (PART) in Stockholm, Sweden.

METHODS

We used a general population subsample age 20 to 64 that answered a postal questionnaire including AUDIT who later participated in a psychiatric interview (n = 1,093). Interviews using Schedules for Clinical Assessment in Neuropsychiatry was used as criterion standard. Diagnoses were set according to the fourth version of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). Agreement between the diagnostic test and criterion standard was measured with area under the receiver operator characteristics curve (AUC).

RESULTS

A total of 1,086 (450 men and 636 women) of the interview participants completed AUDIT. There were 96 individuals with DSM-IV-alcohol dependence, 36 DSM-IV-Alcohol Abuse, and 153 Risk drinkers. AUCs were for DSM-IV-alcohol use disorder 0.90 (AUDIT-C 0.85); DSM-IV-dependence 0.94 (AUDIT-C 0.89); risk drinking 0.80 (AUDIT-C 0.80); and any criterion 0.87 (AUDIT-C 0.84).

CONCLUSIONS

In this general population sample, AUDIT and AUDIT-C performed outstanding or excellent in identifying dependency, risk drinking, alcohol use disorder, any disorder, or risk drinking.

Stability and change in alcohol habits of different socio-demographic subgroups--a cohort study

Background

Stability in alcohol habits varies over time and in subgroups, but there are few longitudinal studies assessing stability in alcohol habits by socio-demographic subgroups and potential predictors of stability and change. The aim was to study stability and change in alcohol habits by sex, age, and socio-economic position (SEP).

Methods

Data derived from two longitudinal population based studies in Sweden; the PART study comprising 19 457 individuals aged 20-64 years in 1998-2000, and the Stockholm Public Health Cohort (SPHC) with 50 067 individuals aged 18-84 years in 2002. Both cohorts were followed-up twice; PART 2000-2003 and 2010, and SPHC 2007 and 2010. Alcohol habits were measured with the Alcohol Use Disorders Identification Test (AUDIT), and with normal weekly alcohol consumption (NWAC). Stability in alcohol habits was measured with intraclass correlation. Odds ratios were estimated in multinomial logistic regression analysis to predict stability in alcohol habits.

Results

For the two drinking measures there were no consistent patterns of stability in alcohol habits by sex or educational level. The stability was higher for older age groups and self-employed women. To be a man aged 30-39 at baseline predicted both increase and decrease in alcohol habits.

Conclusions

The findings illustrate higher stability in alcohol habits with increasing age and among self-employed women with risky alcohol habits. To be a man and the age 30-39 predicted change in alcohol habits. No conclusive pattern of socio-economic position as predictor of change in alcohol habits was found and other studies of potential predictors seem warranted.

Continuing care for patients with alcohol use disorders: a systematic review

BACKGROUND

A chronic care perspective should be adopted in the treatment of patients with alcohol use disorders (AUDs). Initial treatment in a more intense psychiatric care setting should be followed by continuing care. This systematic review aims to identify effective continuing care interventions for patients with AUDs.

METHODS

Electronic databases were searched up to February 2013 (MEDLINE, EMBASE, CENTRAL, CINAHL and PsycINFO) to identify RCTs studying continuing care interventions for patients with AUDs. Study selection and quality appraisal was done independently by two reviewers. Drinking and treatment engagement outcomes were considered. Relative risks and mean differences were calculated with 95% confidence intervals. A statistical pooling of results was planned.

RESULTS

20 trials out of 15,235 identified studies met the inclusion criteria. Only six were evaluated as methodologically strong enough and included for further analysis. Interventions ranged from telephone calls and nurse follow-up to various forms of individual or couples counseling. Four trials suggested that supplementing usual continuing care with an active intervention empowering the patient, could be beneficial to drinking outcomes. Effect sizes were limited and not consistent across all outcomes. Because of heterogeneity in the interventions and outcome measures, a meta-analysis could not be performed.

CONCLUSION

For the treatment of a disease with such devastating consequences, it is remarkable how few high quality studies are available. Adding an active intervention to usual continuing care seems to improve treatment outcomes. We propose an integrated care program with different elements from the selected studies and discuss implications for further research.

Alcohol use among older adults: SABE cohort study, São Paulo, Brazil

In recent years, Brazil has demonstrated a new demographic pattern characterized by a reduction in both birth and mortality rates and a significant increase in the number of older adults. The purpose of the present study was to describe the frequency of alcohol intake in a representative sample community of older adults in the city of São Paulo, Brazil, followed over a six-year period. A prospective Saúde, Bem-Estar e Envelhecimento (SABE [Health, Wellbeing and Aging]) cohort study conducted in 2000 and 2006 in City of São Paulo, Brazil. 2,143 individuals aged 60 years or older selected through multi-stage sampling in the year 2000 (41.4% male and 58.6% women) and 1,115 individuals belonging to the follow-up cohort evaluated in 2006. The frequency of alcohol intake in the previous three months was obtained through self-reports of interviewees. The results demonstrate that in 2000, alcohol consumption was less than one day a week among 79.7% of the sample, one to three days a week among 13.0% and four or more days a week among 7.3%. In agreement with findings on other populations, consumption four or more days a week was more frequent among the male gender as well as those with greater schooling and income and good self-rated health (p<0.05). The longitudinal analysis demonstrated an increase in the frequency of alcohol consumption one to three times a week among the individuals in the 2006 follow-up study. In the present population-based sample, alcohol intake was low and the frequency of moderate alcohol consumption increased over the years. The present study can assist understanding the changes in alcohol intake among older adults throughout time and the ageing process.

Regional differences associated with drinking and driving in Brazil

OBJECTIVE

To evaluate regional differences and similarities associated with drinking and driving (DUI) in the five Brazilian macro-regions.

METHOD

A roadside survey was conducted in the 27 Brazilian state capitals. A total of 3,398 drivers were randomly selected and given a structured interview and a breathalyzer test. To determine the predictors of positive blood alcohol concentration (BAC) in each region, a MANOVA was performed, and 3 groups were used as follows: 1) North and Northeast, 2) South and Midwest, and 3) Southeast. A Poisson robust regression model was performed to assess the variables associated with positive BAC in each group.

RESULTS

Of all surveyed drivers, 2,410 had consumed alcohol in the previous 12 months. Most were male, with a median age of 36. Leisure as the reason for travel was associated with positive BAC in all 3 groups. Low schooling, being older than 30, driving cars or motorcycles and having been given a breathalyzer test at least once in their lives predicted DUI in at least two different groups.

CONCLUSIONS

Factors , especially low schooling and leisure as a reason for travel, associated with drinking and driving were similar among regions, although certain region-specific features were observed. This information is important for aiming to reduce DUI in the country.

Changes in alcohol consumption and drinking patterns during 11 years of follow-up among ageing men: the FinDrink study

BACKGROUND

Alcohol consumption is often reported to decrease with ageing. We investigated alcohol consumption and drinking patterns in an ageing population-based male sample during an 11-year follow-up period.

METHODS

This study with baseline and two follow-up examinations (at 4 and 11 years) included 1516 randomly selected participants, aged 42, 48, 54 and 60 years from Eastern Finland. Alcohol consumption and drinking patterns during the year preceding the examination were assessed. Data were analysed using Generalized Estimating Equations and Mixed Models.

RESULTS

Over the 11-year study period, the amount of alcohol consumed weekly increased among the 42-year-olds (P < 0.001) and remained constant among the older cohorts. The risk of frequent drinking (alcohol consumption at least twice weekly) increased among all cohorts (OR = 2.04, 95% CI = 1.50-2.79 for 42-year-olds; OR = 1.71, 95% CI = 1.13-2.58 for 48-year-olds; OR = 1.67, 95% CI = 1.16-2.39 for 54-year-olds and OR = 1.67, 95% CI = 1.21-2.29 for 60-year-olds). There was also an increasing probability of heavy consumption (more than 14 weekly drinks) among the 42-year-olds (OR = 1.47, 95% CI = 1.09-2.00). The risk of binging (six-plus drinks at one occasion) decreased among the older participants (OR = 0.65, 95% CI = 0.47-0.89 for 54-year-olds, and OR = 0.56, 95% CI = 0.39-0.81 for 60-year-olds).

CONCLUSION

Finnish men born in 1926-1946 do not seem to decrease drinking while ageing. In contrast those born in 1944-1946 increase drinking until their 60's. This should be taken into consideration in planning health services for aged men in the near future.