Changes in millennial adolescent mental health and health-related behaviours over 10 years: a population cohort comparison study.

There is evidence that mental health problems are increasing and substance use behaviours are decreasing. This paper aimed to investigate recent trends in mental ill health and health-related behaviours in two cohorts of UK adolescents in 2005 and 2015. Prevalences in mental health (depressive symptoms, self-harm, anti-social behaviours, parent-reported difficulties) and health-related behaviours (substance use, weight, weight perception, sleep, sexual intercourse) were examined at age 14 in two UK birth cohorts; Avon Longitudinal Study of Parents and Children (ALSPAC, N = 5627, born 1991-92) and Millennium Cohort Study (MCS, N = 11 318, born 2000-02). Prevalences and trend estimates are presented unadjusted and using propensity score matching and entropy balancing to account for differences between samples. Depressive symptoms (9% to 14.8%) and self-harm (11.8% to 14.4%) were higher in 2015 compared with 2005. Parent-reported emotional difficulties, conduct problems, hyperactivity and peer problems were higher in 2015 compared with 2005 (5.7-8.9% to 9.7-17.7%). Conversely, substance use (tried smoking, 9.2% to 2.9%; tried alcohol, 52.1% to 43.5%, cannabis, 4.6% to 3.9%), sexual activity (2% to 0.9%) and anti-social behaviours (6.2-40.1% to 1.6-27.7%) were less common or no different. Adolescents in 2015 were spending less time sleeping (<8 h 5.7% to 11.5%), had higher body mass index (BMI) (obese, 3.8% to 7.3%) and a greater proportion perceived themselves as overweight (26.5% to 32.9%). The findings should be interpreted bearing in mind limitations in ability to adequately harmonize certain variables and account for differences in attrition rates and generalizability of the two cohorts. Given health-related behaviours are often cited as risk factors for poor mental health, our findings suggest relationships between these factors might be more complex and dynamic in nature than currently understood. Substantial increases in mental health difficulties, BMI and poor sleep-related behaviours highlight an increasing public health challenge.

Patalay P ，Gage SH 《-》

Associations Between Adolescent Mental Health and Health-Related Behaviors in 2005 and 2015: A Population Cross-Cohort Study.

Adolescent mental ill-health is a growing concern. There is little understanding of changes over time in the associations between mental health and health-related behaviors and outcomes (such as substance use, antisocial behavior, and obesity). We investigate whether the associations between different health and health-related outcomes in adolescence are changing over time in two recent cohorts of adolescents born 10 years apart. Data from two UK birth cohort studies, the Avon Longitudinal Study of Parents and Children (ALSPAC, born 1991-92, N = 5,627, 50.7% female) and Millennium Cohort Study (MCS, born 2000-2, N = 11,318, 50.6% female) at age 14 are analyzed. The health outcomes of focus are depressive symptoms, substance use (alcohol, smoking, cannabis, and other drugs), antisocial behaviors (assault, graffiti, vandalism, shoplifting and rowdy behavior), weight (body mass index [BMI]), weight perception (perceive self as overweight), and sexual activity (had sexual intercourse). Regression analyses are conducted to examine associations between these variables with cohort as a moderator to examine cohort differences. The directions of associations between mental-health and health-related behaviors (e.g., smoking) are similar over time; however, their strength across the distribution has changed. While smoking and alcohol use behaviors are decreasing in adolescents, those that endorse these behaviors in 2015 are more likely to have co-occurring mental ill-health than those born in 2005. Similarly, higher BMI is more strongly associated with depressive symptoms in 2015 compared to 2005. Adverse health-related outcomes such as greater substance use, mental health difficulties, and higher BMI appear to be more likely to cluster together in the more recent cohort, with implications for public health planning, service provision, and lifelong disease burden.

Gage SH ，Patalay P 《-》

Mental health, social adversity, and health-related outcomes in sexual minority adolescents: a contemporary national cohort study.

Sexual minority adolescents are more likely to have mental health problems, adverse social environments, and negative health outcomes compared with their heterosexual counterparts. There is a paucity of up-to-date population-level estimates of the extent of risk across these domains in the UK. We analysed outcomes across mental health, social environment, and health-related domains in sexual minority adolescents compared with their heterosexual counterparts in a large, contemporary national cohort. The Millennium Cohort Study (MCS) is a birth cohort study in the UK following up children born between Sept 1, 2000, and Jan 11, 2002 across England, Wales, Scotland, and Northern Ireland. Children recruited from the MCS have been followed up over six recruitment sweeps to date at ages 9 months, 3 years, 5 years, 7 years, 11 years, and 14 years. We analysed mental health, social, and health-related outcomes in sexual minority versus heterosexual adolescents at age 14 years. Additionally, we estimated the accumulation of multiple adverse outcomes in both groups. The primary aim of the study was to assess whether sexual minority adolescents experienced more adverse outcomes than heterosexual adolescents. Between January, 2015, and April, 2016, 9885 adolescents provided a response about their sexual attraction. 629 (6%) of 9885 adolescents (481 female participants and 148 male participants) were identified as sexual minorities. 9256 (94%) of 9885 participants (4431 female and 4825 male) were attracted to the opposite sex or not attracted to the same sex and identified as heterosexual. Sexual minority adolescents were more likely to experience high depressive symptoms (odds ratio [OR] 5·43, 95% CI 4·32-6·83; p<0·0001), self-harm (5·80, 4·55-7·41; p<0·0001), lower life satisfaction (3·66, 2·92-4·58; p<0·0001), lower self-esteem (β 1·83, 95% CI 1·47-2·19; p<0·0001), and all forms of bullying and victimisation. Sexual minorities were more likely to have tried alcohol (OR 1·85, 95% CI 1·47-2·33; p<0·0001), smoking (2·41, 1·92 -3·03; p<0·0001), and cannabis (3·22, 2·24-4·61; p<0·0001), and also had increased odds of being less physically active (β 0·36, 95% CI 0·25-0·46; p<0·0001), perceiving themselves as overweight (OR 1·73, 95% CI 1·40-2·14; p<0·0001), and dieting to lose weight (1·98, 1·58-2·48; p<0·0001). Sexual minority adolescents had more co-occurring mental health outcomes (mean 1·43 of 3 outcomes, 95% CI 1·34-1·52) compared with heterosexual adolescents (0·40 of 3 outcomes, 0·38-0·41), and more total cumulative difficulties (mean 9·43 of 28 outcomes, 95% CI 9·09-9·76 in sexual minority adolescents vs 6·16 of 28 outcomes, 6·08-6·23 in heterosexual adolescents). Sexual minority adolescents in the UK experience disparities in mental health, social, and health-related outcomes despite living in a time of substantial progress in rights for sexual minorities. These adverse outcomes co-occur, with implications for lifelong health and social outcomes. Health and educational practitioners should be aware of the increased risk for adverse outcomes in sexual minority adolescents. None.

Amos R ，Manalastas EJ ，White R ，Bos H ，Patalay P ... -  《-》

Changes in the Prevalence and Correlates of Weight-Control Behaviors and Weight Perception in Adolescents in the UK, 1986-2015.

Solmi F ，Sharpe PhD H ，Gage SH ，Maddock J ，Lewis G ，Patalay P ... -  《-》

Association of Child and Adolescent Mental Health With Adolescent Health Behaviors in the UK Millennium Cohort.

Hoare E ，Werneck AO ，Stubbs B ，Firth J ，Collins S ，Corder K ，van Sluijs EMF ... -  《JAMA Network Open》