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This observational, longitudinal study's purpose was to investigate whether social network integration has a moderating effect on smoking initiation among those with attention deficit hyperactivity disorder (ADHD). Data were drawn from the National Longitudinal Study of Adolescent to Adult Health, a nationally representative longitudinal dataset. Social network and smoking data were collected in schools, with a 6-year follow-up that included ADHD symptoms and reported smoking. Social integration was measured as peer friendship nominations (degree) and the influence of an individual on the entire social network (centrality). Multilevel logistic regression found a main effect for ADHD symptoms and low numbers of friendship nominations on smoking initiation, but social network measures were not significant moderators of the relationship between ADHD symptoms and smoking initiation among adolescents. Further investigation of the drivers of smoking initiation among those with ADHD is warranted. [ABSTRACT FROM AUTHOR]

Epigenetic modifications are chemical changes that can modify gene expression without changing the sequence of the gene. These modifications are potentially identifiable and reversible, making the epigenome an important area of research for discovering biomarkers to identify those who may be at risk and providing therapeutic interventions to prevent adverse health outcomes. African Americans bear a disproportionate risk of adverse health outcomes (e.g., hypertension, cancer). Indeed, African American women experience preterm birth (PTB; <37 completed weeks gestation) at more than twice the rate of non-Hispanic White women. Research suggests that environmental influences may play a significant role in PTB outcomes for this population. However, the biological pathways by which these influences contribute to PTB are poorly understood. This paper describes research methods and ethical considerations for the collection and analysis of biological samples based on our study examining the epigenetic regulation of stress pathways in PTB in pregnant African American women. [ABSTRACT FROM AUTHOR]