Bidirectional Causal Associations Between Same-Sex Attraction and Psychological Distress: Testing Moderation and Mediation Effects

The Chain Mediation Effect of Victimization and Neuroticism on the Association Between Sexual Orientation and Depressive Symptoms: A Prospective Birth Cohort Study

This study tested whether sexual orientation differences in depressive symptoms were partially explained by the chain mediation effect of neuroticism and victimization. Using the Avon Longitudinal Study of Parents and Children from the UK (N = 4647, 36.52% men, 88% White), self-reported neuroticism, sexual orientation, and depressive symptoms were measured at age 13.5, 21, and 22 years, respectively. Childhood abuse between birth and age 11 years and the individuals' experiences of being bullied at age 17.5 years were measured as the components of victimization. Structural equation modeling was used to analyze the data. Non-heterosexual individuals reported higher depressive symptoms than heterosexual individuals, with a total effect (standardized path coefficient) of 0.590 and 0.768 for men and women, respectively. This association was partially explained by childhood abuse (indirect effect = 0.043 and 0.046 for men and women, respectively) and neuroticism directly (indirect effect = 0.036 and 0.056 for men and women, respectively). Sexual orientation differences in depressive symptoms were also partially explained by a path through increased risk of experiencing childhood abuse leading to higher levels of neuroticism (indirect effect = 0.004 and 0.009 for men and women, respectively) and by a path through higher levels of neuroticism leading to increased risk of being bullied (indirect effect = 0.004 and 0.002 for men and women, respectively). The findings suggest that while some of the association between sexual orientation and depression might be explained by neuroticism and experiences of victimization measured prospectively, these factors do not account for most of this relationship.

Same-Sex Relationships and Criminal Behavior: A Total Population Study in The Netherlands

Sexual minority groups experience elevated risk across a range of adverse outcomes. Previous studies from the USA showed that these risks include contact with the criminal justice system for sexual minority females but not for males. This study examined whether this relationship between sexual minority status and criminal behavior was also found in a more secular country like the Netherlands with more progressive attitudes toward sexual minorities. Furthermore, the study aimed to examine whether this relationship applied to various types of crime and could be explained by unmeasured familial factors. Longitudinal data from the Dutch national population, including 75,362 individuals in a same-sex relationship and 3,464,906 individuals in opposite-sex relationships, were used to compare the risk of crime among males and females in same-sex and opposite-sex unions. Discordant sibling models were included to increase control over possible sources of confounding from shared familial factors. Analyses were repeated for six types of crime, including property offenses, violence, vandalism, and public order offenses, traffic offenses, drugs offenses, and other offenses. The results showed that the direction of the associations between same-sex relationships and offending differed for men and women. In general, men in same-sex relationships were less likely to be a suspect of crime compared to those in opposite-sex relationships [odds ratio (OR) = 0.685; p < .001]. Women in same-sex relationships exhibited higher risk than those in opposite-sex unions (OR = 1.560; p < .001). Similar patterns emerged for most crime types and the discordant sibling models yielded conclusions that were substantively similar to those among the total population.

Childhood Gender Nonconformity and Parental Maltreatment as Mediators of Sexual Orientation Disparities in Childhood Emotional and Behavioral Difficulties

The mechanisms underlying sexual orientation differences in psychopathology originating in childhood remain understudied since sexual orientation does not directly manifest in childhood. This study tested whether childhood gender nonconformity and parental maltreatment before age 6 years 9 months partly explained sexual orientation disparities in the developmental trajectories of emotional and behavioral difficulties from age 6 years 9 months to 11 years 8 months. The Avon Longitudinal Study of Parents and Children was used (2182 boys and 2422 girls, Mage = 15.5, 90% White). After controlling for early life factors, non-heterosexual boys and girls displayed significantly greater emotional and behavioral difficulties than their heterosexual counterparts at all three ages. There was a sex difference in the mediating effects. For girls, sexual orientation disparities in childhood emotional and behavioral difficulties were partially explained by childhood gender nonconformity. For boys, sexual orientation disparities in childhood emotional and behavioral difficulties were partially explained by a path through greater childhood gender nonconformity, leading to increased risk of being the targets of parental maltreatment. Childhood gender nonconformity, parental maltreatment, and other early life factors only partially explain sexual orientation disparities in childhood emotional and behavioral difficulties. The mediating effects of childhood gender nonconformity and parental maltreatment on the association between sexual orientation and childhood emotional and behavioral difficulties differ between the sexes.

Using Instrumental Variables to Measure Causation over Time in Cross-Lagged Panel Models

Cross-lagged panel models (CLPMs) are commonly used to estimate causal influences between two variables with repeated assessments. The lagged effects in a CLPM depend on the time interval between assessments, eventually becoming undetectable at longer intervals. To address this limitation, we incorporate instrumental variables (IVs) into the CLPM with two study waves and two variables. Doing so enables estimation of both the lagged (i.e., "distal") effects and the bidirectional cross-sectional (i.e., "proximal") effects at each wave. The distal effects reflect Granger-causal influences across time, which decay with increasing time intervals. The proximal effects capture causal influences that accrue over time and can help infer causality when the distal effects become undetectable at longer intervals. Significant proximal effects, with a negligible distal effect, would imply that the time interval is too long to estimate a lagged effect at that time interval using the standard CLPM. Through simulations and an empirical application, we demonstrate the impact of time intervals on causal inference in the CLPM and present modeling strategies to detect causal influences regardless of the time interval in a study. Furthermore, to motivate empirical applications of the proposed model, we highlight the utility and limitations of using genetic variables as IVs in large-scale panel studies.

The Challenges and Opportunities for Mental Health Twin Research in Nigeria

The recent interest in increasing diversity in genetic research can be useful in uncovering novel insights into the genetic architecture of mental health disorders - globally and in previously unexplored settings such as low- and middle-income settings like Nigeria. Genetic research into mental health is potentially promising in Nigeria and we reflect on the challenges and opportunities for twin research which may be particularly suited to Nigeria. The higher rates of twinning in Africa and Nigeria specifically, make the twin design an affordable and readily maintainable approach for genetic research in the country. Despite potential challenges with recruitment, data collection, data analysis and dissemination; the success of current efforts suggest that the twin design can tapped even further for greater impact in the country. We highlight some ways in which the scope of twin research can be increased and suggest some ways in which existing challenges can be overcome including recent Patient Participant Involve and Engagement activities.