This was a randomized, controlled clinical trial in which 471 stimulant abusers were recruited from 10 sites to participate in study comparing 12-Step (STAGE-12) plus treatment as usual (TAU) to TAU alone. The purpose of this study was to evaluate reduction in percent of days of stimulant use as measured by self-report. The study also evaluated reduction in percent days of use of other substances, the degree to which STAGE-12 increased involvement in 12-step activities and attendance at 12-step meetings, and the extent to which such 12-step involvement and meeting attendance mediated substance use outcomes.
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