A highly structured, computer-driven psychiatric interview, namely, the CDIS-IV (American Psychiatric Association, 1994; Robins et al., 2002), used for detecting selected DSM-IV Axis I and II disorders, was then administered by a research assistant formally trained in its administration and with 11 years of relevant experience. Patients also completed questionnaires or brief interviews assessing medical history, medication use, demographics, psychiatric symptoms, alcohol and drug use, and cognitive status. The assessments included the Addiction Severity Index (ASI; McLellan, Luborsky, Woody, & O'Brien, 1980), Michigan Alcoholism Screening Test (MAST; Selzer, 1971), Drug Abuse Screening Test (DAST-10; Skinner, 1982), and Beck Depression Inventory Version II (BDI-II; Beck, Steer, & Brown, 1996). In addition, the Kaufman Brief Intelligence Test (KBIT; Kaufman & Kaufman, 1990) was administered to derive an estimate of IQ.
