The King’s Health Questionnaire was designed to assess the quality of life of women with urinary incontinence and LUTS (Kelleher et al, 1997).  It has 21 items covering 8 dimensions of health and each domain has a score of 0 to 100 of health (see attached for scoring algorithm).

Whilst such scores provide an excellent means for judging the effectiveness of health care interventions, they have only a limited application in economic evaluation because they are not based on preferences. The algorithm presented here provides a means of converting the KHQ into a preference-based single index measure of health that can be used to obtain quality adjusted life years (QALYs) from KHQ data for use in cost utility analysis.