Regional and Sex Differences in the Prevalence and Correlates of Early Sexual Initiation Among Adolescents Aged 12-15 Years in 50 Countries.

PURPOSE: This study aimed to investigate the regional and sex differences in the prevalence of early sexual initiation and its correlates among school-going adolescents in 50 countries. METHODS: We used data from the Global School-based Health Survey from 50 countries in 2009-2015 for 124,091 adolescents (53.5% girls) aged 12-15 years. Using meta-analysis with random effects, we estimated the prevalence of early sexual initiation (i.e., having first sexual intercourse at ≤14 years) by sex, region, and country income classification. Multilevel mixed-effect logistic regressions including a random intercept for countries were used to investigate the correlates of early sexual initiation. RESULTS: Overall, 14.2% (95% confidence interval: 12.1-16.2) of adolescents aged 12-15 years had early sexual initiation, with boys reporting much higher than girls (19.7%, 16.9-22.5 vs. 8.9%, 7.6-10.3). The prevalence of early sexual initiation was the highest in the region of the Americas (18.4%, 15.2-21.5) and the lowest in the South-east Asia region (5.3%, 2.6-8.0). Adolescents from high-income and lower middle-income countries had the highest (19.5%, 13.5-25.5) and the lowest (7.3%, 5.5-9.0) prevalence, respectively. Older age, anxiety, loneliness, suicidal ideation, being bullied, physical fight, school truancy, smoking, drinking alcohol, illicit drug use, physical activity, and being overweight were associated with higher odds of early sexual initiation, whereas female sex, parental monitoring, and peer support were protective. There was little or no evidence of heterogeneity by sex and across regions for these associations. CONCLUSIONS: Substantial differences in the prevalence are observed by sex and across regions for early sexual initiation among adolescents, whereas its correlates remain relatively similar when examined separately by these characteristics.

Parent-adolescent relationships and their associations with adolescent suicidal behaviours: Secondary analysis of data from 52 countries using the Global School-based Health Survey.

BACKGROUND: Despite the potential benefits of parents-adolescent relationships on suicidal behaviours among adolescents, research on these topics are importantly limited by lack of comprehensiveness, difficulties in cross-country comparisons, and limited generalisability, among others. We aimed to estimate the prevalence of various aspects of parents-adolescent relationships and suicidal behaviours by sex and region, and to investigate their associations. METHODS: We used data from the Global School-based Health Survey (GSHS) from 52 countries in 2009-2015 for 120 858 adolescents (53.9% girls) aged 12-15 years. Using meta-analysis with random effects, we estimated the prevalence of parents-adolescent relationships (i.e. understanding problems, monitoring academic and leisure time activities, and respecting privacy) and suicidal behaviours (i.e. suicidal ideation, suicide planning, and suicide attempt). Multi-level mixed-effect logistic regressions were used to investigate their associations. FINDINGS: Overall, boys and girls reported similar levels of parental understanding of problems (35.8% vs. 36.8%), monitoring academic activities (41.8% vs. 41.1%), and respecting privacy (69.6% vs. 69.7%), whereas girls reported higher level of parental monitoring of leisure time activities than boys (44.9% vs. 40.0%). Adolescents in the Western Pacific region reported the lowest level of parental understanding of problems and monitoring activities, while those in South-East Asia region least reported that their parents respected their privacy. The overall prevalence of any suicidal behaviour was higher in girls than boys (26.2% vs. 23.0%). Suicidal behaviour was less likely in adolescents if their parents understood their problems (odds ratio, 95% confidence intervals: 0.70, 0.68-0.73), monitored their academic (0.81, 0.78-0.84) and leisure time activities (0.73, 0.71-0.75), and respected their privacy (0.83, 0.80-0.86). There was evidence of heterogeneity in those associations by sex and regions. INTERPRETATIONS: Although the prevalence of parents-adolescent relationships and adolescent suicidal behaviours varied particularly by sex and region, there were strong and independent associations among them.