Data were taken from the community-based Drug Abuse Treatment Outcome Study for adolescents (DATOS-A) [31] which was sponsored by the National Institute on Drug Abuse (NIDA) to evaluate treatment effectiveness across short-term inpatient, residential, and outpatient programs. The present study draws from two intake interviews separated by one week. The first obtained measures of patient characteristics and behaviors (including substance use); the second assessed psychiatric consequences, behavioral problems, and treatment-oriented variables.