Construct Validity of the Health Utilities Index Mark 2 and Mark 3 to Measure Health-Related Quality of Life of Residents in Long-Term Care Facilities.

Abstract

The purpose is to evaluate the construct validity of two generic health measures, the Health Utilities Index Mark 2 (HUI2) and Mark 3 (HUI3) in residents of long-term care (LTC) facilities, using a convergent/divergent validity approach, with the Functional Independence Measure (FIM), Quality of Life-Alzheimer's Disease (QOL-AD) and Resident Assessment Instrument (RAI) 2.0 as comparators. Health status of 130 residents with dementia residing in one of seven LTC facilities was evaluated by their Healthcare Aides who were their primary care assistants. A priori hypotheses on the magnitude and direction of the correlations were formulated by two clinician/researchers and a researcher familiar with the measures and this population. Predicted and observed correlations were compared. Mean overall HUI2 (0.48, SD 0.16) and HUI3 scores (0.31, SD 0.27) were indicative of severe disability. Of the 208 a priori hypotheses, 39.9% (n = 83) matched the observed correlations, 29.8% were underestimated and 19.7% were overestimated by one category. Findings support the use of the HUI2 and HUI3 in measuring health-related quality of life in dementia-related research to complement disease-specific measures.