This booklet describes the population of youth in chemical dependency treatment programs. The Minnesota Student Survey was administered to 500 voluntary adolescent participants in inpatient and outpatient chemical dependency treatment programs in 1995 and 1996. These youth were matched with adolescents selected randomly from the public school student population. This analysis provides a comparison between youth in treatment programs and youth in public schools. Survey administration, matching process, and criteria for admission to chemical dependency treatment are reviewed. A description of the youth, their families, and their environments includes information about family composition and relationships, family alcohol and drug problems, family violence, sexual abuse, date violence and rape, and multiple victimizations. Levels of psychological distress are described; the picture includes low self-esteem, emotional distress, suicidal behavior, and self-injury. Insights into sexual activity levels, school perceptions, and behaviors are presented. Antisocial and illegal behaviors, including delinquent behavior, recent trends in substance use, cigarette use, alcohol and drug use prevalence, high-risk substance use, and consequences of substance use are discussed. The findings are summarized, and recommendations are presented. (Contains 32 references.) (EMK)