for Substance Use in Schizophrenia

This study examined the internal reliability of standardized meas-ures of substance use expectan-cies and motives in a schizophre-nia population (n = 70) and the relationship of these expectancies and motives to alcohol and drug use disorders. Internal reliabili-ties were uniformly high for the subscales of the expectancy and motive measures. Analyses of the relationship between substance use disorders and expectancies revealed strong substance-specific expectations. Alcohol expectancies were related to alcohol disorders but not to drug disorders; co-caine expectancies were related to drug but not to alcohol disor-ders; and marijuana expectancies were more strongly related to drug than to alcohol use disor-ders. In contrast, motives were related to substance use disor-ders, and self-reported substance use problems were related to ex-pectancies and motives in a non-specific manner. These results suggest that expectancy and mo-tive questionnaires developed for the primary substance abuse population may be valid for psy-chiatric populations. Research on motives and expectancies may help to clarify the functions of substance abuse in persons with schizophrenia