Personality-based subtypes of chemically dependent patients.

Jackson's Personality Research Form E (PRF) was administered to a large, heterogeneous group of adult inpatients with diagnoses of alcohol and/or drug dependence. Cluster analysis of PRF factor scores yielded five distinct patient subtypes: hostile-dependent, cooperative-nonreflective, socially uninvolved, impulsive-unsociable, and hostile-overcontrolled. The subtypes differed on two MMPI canonical variables and on self-reported high risk factors for substance usage. Implications of the findings for more appropriate matching of patients to chemical dependency interventions are offered.