The present study examined the joint development of substance use and externalizing problems in early and middle adolescence. First, it was tested whether the relevant groups found in previous studies i.e., those with an early onset, a late onset, and no onset or low levels of risk behavior could be identified, while using a developmental model of…

Structural models were used to examine developmental stages of antisocial behavior and their relation to during-treatment performance of 245 probationers in an inpatient substance abuse treatment program. Separate childhood and adulthood antisocial functioning components predicted psychological functioning and program perceptions during treatment.…

Examined the role of individual characteristics and peer influences in evoking early substance abuse in young boys. Individual characteristics, such as fighting, hyperactivity, oppositional behaviors, and likability, were found to be pivotal in the development of substance abuse--more than friends' deviance. Results suggest that prevention…