title: A cohort study found the RAND-12 and Health Utilities Index Mark 3 demonstrated construct validity in high-risk primary care patients.
abstract: OBJECTIVE
  The Short Form 12 (SF-12) is widely used in primary care settings. The RAND-12 Health Status Inventory (HSI) and the Health Utilities Index Mark 3 (HUI3) have not been as widely used in such settings. The objective of this study was to examine the construct validity of the RAND-12 and HUI3 in the context of high-risk primary care patients.
  
  
  METHODS
  The SF-12, HUI2, and HUI3 were administered to a cohort of high-risk primary care patients. RAND-12 summary scores for physical and mental health were generated. Single-attribute utility scores for each dimension of health status and overall health in HUI3 were computed. A priori hypotheses were specified.
  
  
  RESULTS
  In general, the relationships among RAND-12 and HUI3 scores were consistent with construct validity. Twelve of 24 a priori predictions were confirmed. However, predictions about the correlations between the number of medical conditions and the number of medications and the measures of health-related quality of life were, in general, not confirmed.
  
  
  CONCLUSIONS
  The RAND-12 and HUI3 seem to be useful among primary care patients with diverse chronic conditions. Further investigation is warranted.
authors.affiliation: Institute of Health Economics, #1200, 10405 Jasper Avenue, Edmonton, Alberta, T5J 3N4, Canada. david.feeny@kpchr.orh
authors.forename: David
authors.initials: D
authors.lastname: Feeny
authors.forename: Karen
authors.initials: K
authors.lastname: Farris
authors.forename: Isabelle
authors.initials: I
authors.lastname: Côté
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Johnson
authors.forename: Ross T
authors.initials: RT
authors.lastname: Tsuyuki
authors.forename: Ken
authors.initials: K
authors.lastname: Eng
mesh_terms: D015331:Cohort Studies; D006305:Health Status Indicators; D006801:Humans; D011320:Primary Health Care / Q000706:statistics & numerical data*; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires