The development and application of indices of health: general methods and a summary of results.

A multidisciplinary group has developed a health index questionnaire designed to measure the social, emotional, and physical function of free-living populations. The strategy has been found to be generally applicable, capable of application by lay interviewers, acceptable to interviewees, and amenable to index construction. Furthermore, initial evaluations of the resulting health indices suggest that they are biologically and clinically valid. These health indices have been successfully applied in a randomized trial of innovative primary care services. The comceptualization of individual sections of the health index questionnaire for each of these three functional areas, the generation of the instrument, and the evaluation of questionnaire responses for their biologic and clinical validity are summarized here.