The study tested whether adolescents receiving substance abuse treatment at facilities offering full (can treat all psychiatric conditions) or partial (cannot treat severe or persistent mental illness) mental health services have better 12-month substance use and mental health outcomes than youths at facilities with no mental health services.

Data were collected from 3,235 adolescents who were assessed at baseline and at 12 months at one of 50 adolescent treatment facilities. Propensity scores were applied to compare client outcomes from three types of facilities (full, partial, or no mental health services); weighted linear models were estimated to examine outcomes. 

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