A retrospective investigation of an intensive outpatient substance abuse treatment program.

Outpatient treatment for chemical dependency has been found to be both clinically effective and cost efficient. The purpose of this retrospective investigation was to evaluate program completion data and variables related to attrition for an intensive outpatient substance abuse treatment program. Subjects were 488 clients enrolled in the Smithers Evening Rehabilitation Program between 1991 and 1995. Client drug preference was found to be an important factor related to treatment retention, with cocaine abusers having the highest attrition rates. In addition, increasing age was an advantage in predicting who would complete the initial phase of treatment. Implications for programmatic changes, clinical practice, and future research are considered.