The health assessment questionnaire 1992: status and review.

Over 100 papers describing and utilizing the Stanford Health Assessment Questionnaire (HAQ) have been published since 1980. A brief overview of the HAQ is presented along with a guide to the accumulated literature. The topics covered include: studies using the disability, pain, economic, and drug side effect dimensions of the HAQ; reliability and validity studies; applications to various rheumatic diseases; language adaptations; modifications and derivative scales; studies correlating the HAQ with sociodemographic, health status, laboratory, and physical measures; and randomized controlled trials and observational studies using the HAQ. A few comments regarding future directions for research are also presented.