Abstract
This study examined the clinical outcomes of dual diagnosis patients with severe chronic mental illness and a secondary diagnosis of an addictive substance (N = 48) who attended a daily Day Treatment Center (DTC). Clinical interventions included the DTC program plus weekly dual diagnosis groups. Outcome measures included urine toxicology screens, Global Assessment of Functioning (GAF) scores, relapses, and hospitalizations. Results revealed that the length of stay (LOS) in the DTC program was the only statistically significant predictor of both pre and post study GAF scores for all three groups. Patients with one year of remission were less likely to relapse. The longer the patient's stay in the DTC program, the better the treatment outcome.