Psychometric properties of the Spanish version of two mental health outcome measures: World Health Organization Disability Assessment Schedule II and Lehman's Quality Of Life Interview

Abstract

This study presents data on the cultural adaptation to Latino populations of two outcome measures that respond to the need for developing comprehensive instruments for outcome assessments in minority populations. We examined the psychometric properties of outcome measures designed to assess impairment in functioning, and quality of life. Impairment in functioning was measured with the Disability Assessment Schedule II (WHO-DASII) developed by the World Health Organization (1997) and quality of life was measured with A. F. Lehman's (A. F. Lehman, 1983; A. F. Lehman, 1988) shortened Quality of Life Interview (QOLI). Spanish speaking consumers (N = 198) from Fresno (CA), San Antonio (TX) and San Juan (PR) participated in this study. They were recruited from both mental health outpatient clinics and primary care rural clinics. The WHO-DASII showed good to excellent internal consistency in all sites (alpha = .72 to .97) except for one subscale (Self-Care alpha = .47). Test-retest reliability estimates were mostly moderate to substantial (.57 to .83), again with one exception, the Self-Care subscale (.46). For the QOLI internal consistency ranged from .34 to .98 and test-retest reliability ranged from .40 to .86 across all sites. An initial validation strategy using both known-groups and concurrent validity produced promising evidence of the construct validity of both measures. The Spanish versions of the WHO-DASII and the QOLI lend support to the translation and adaptation process to which these instruments were subjected.