title: A comparison of the EuroQol-5D and the Health Utilities Index mark 3 in patients with rheumatic disease.
abstract: OBJECTIVE
  To compare the performance of 2 commonly used utility-based health-related quality of life (HRQoL) instruments [the EuroQol-5D (EQ-5D) and Health Utilities Index mark 3 (HUI3)] in patients with rheumatic disease.
  
  
  METHODS
  Consecutive outpatients with rheumatic diseases were interviewed twice within 2 weeks using a standard questionnaire containing the EQ-5D, HUI3, and the Medical Outcome Study Short-Form 36 Health Survey (SF-36, used to categorize health status) and assessing clinical and demographic characteristics. EQ-5D and HUI3 utility scores were compared and their construct validity and test-retest reliability were examined by comparing these scores in groups differing in health status and using intraclass correlation coefficients (ICC), respectively.
  
  
  RESULTS
  EQ-5D and HUI3 utility scores in 114 patients differentiated well between varying health states; e.g., patients with higher SF-36 vitality scores had better EQ-5D and HUI3 utility scores (mean: 0.79 for both instruments) than patients with lower vitality scores (mean: 0.68 and 0.69, respectively) (p < 0.01 for both comparisons). ICC values for the EQ-5D and HUI3 were 0.64 and 0.75, respectively (n = 90, median interval: 7 days). EQ-5D and HUI3 utility scores were similar (mean +/- SD: 0.75 +/- 0.21 vs 0.76 +/- 0.17, p = 0.647, paired t test) and showed moderate correlation (Spearman's r: 0.45, p < 0.001). Differences were present in patients' responses to these 2 instruments: e.g., 12 patients reporting no problems with mobility (EQ-5D item) reported different levels of disability with ambulation (HUI3 item).
  
  
  CONCLUSIONS
  The EQ-5D and HUI3 performed equally well in measuring utility-based HRQoL in patients with rheumatic disease, although they measured slightly different, though related, dimensions of health.
authors.affiliation: Department of Pharmacy, National University of Singapore, Singapore.
authors.forename: Nan
authors.initials: N
authors.lastname: Luo
authors.forename: Ling-Huo
authors.initials: LH
authors.lastname: Chew
authors.forename: Kok-Yong
authors.initials: KY
authors.lastname: Fong
authors.forename: Dow-Rhoon
authors.initials: DR
authors.lastname: Koh
authors.forename: Swee-Cheng
authors.initials: SC
authors.lastname: Ng
authors.forename: Kam-Hon
authors.initials: KH
authors.lastname: Yoon
authors.forename: Sheila
authors.initials: S
authors.lastname: Vasoo
authors.forename: Shu-Chuen
authors.initials: SC
authors.lastname: Li
authors.forename: Julian
authors.initials: J
authors.lastname: Thumboo
mesh_terms: D000328:Adult; D044466:Asian People; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011237:Predictive Value of Tests; D011788:Quality of Life; D015203:Reproducibility of Results; D012216:Rheumatic Diseases / Q000503:physiopathology*; D012720:Severity of Illness Index; D012846:Singapore; D011795:Surveys and Questionnaires / Q000592:standards