We conducted a longitudinal study on university students’ drinking groups, with a focus on peer-reported and self-reported status as predictors of students’ drinking-related behavior. We first examined average between-persons differences in group members’ typical status as a predictor of systematic changes in their drinking-related behavior over time. We then examined within-person effects, or how students’ drinking-related behavior changes as a function of time-specific changes in their typical status.
The current study estimates classes of polysubstance use in a large group of adolescents (ages 12–18 at baseline) and examines the longitudinal trajectories of cigarette, alcohol, marijuana, and illicit drug use from adolescence to young adulthood for each class.
The current study examined the reciprocal relationships between crime, substance use, and social risk among emerging adults (aged 18–25 years) in substance use treatment.