The Structured Clinical Interview for DSM-IV Disorders (SCID; First et al., 1995) was administered to all participants to assess whether the subjects met criteria for Axis I disorders. The SCID is designed to be given by trained interviewers and allows for rapid elimination of clearly irrelevant diagnoses. All SCID interviews were administered by masters or doctoral level researchers, and reviewed by the authors (RS, TEN, and MHL). Lifetime prevalence of DSM-IV diagnoses was assessed across the sample. Interviewers determined whether a disorder was primary or substance-induced using the algorithms within the SCID that correspond to established DSM-IV criteria. These criteria state that the essential feature of a drug-induced disorder is the onset of symptoms in the context of drug use, intoxication, or withdrawal. See Appendix I for DSM-IV criteria.
