Ethnic differences in psychosocial factors in methadone maintenance: Hmong versus non-Hmong

Little is known about the characteristics of U.S.-based Asian populations undergoing methadone maintenance treatment for opioid use disorders. We evaluated psychosocial factors in 76 Hmong and 130 non-Hmong on methadone maintenance for at least two months in a single urban methadone maintenance clinic. Assessments included the Addiction Severity Index 5th Edition, the Symptom Checklist-90, and the Structured Clinical Interview for DSM-IV Axis I Disorders. The Hmong were older, predominately male, and on lower doses of methadone than the non-Hmong. Hmong had significantly lower ASI composite scores across all dimensions except employment and legal. While the SCL-90 Global Severity Index (GSI) score did not differ between groups, the Hmong had lower scores in the interpersonal sensitivity, depression, anxiety, hostility, and paranoid ideation dimensions. Sixty-seven percent of Hmong and 29% of non-Hmong were without Axis I diagnoses (p <.001). There was no difference between the groups in DSM-IV substance use diagnoses. The extent to which these psychosocial differences impact methadone dose requirements and treatment outcomes in Hmong and non-Hmong remains unknown.