Rheumatology 1999; 38: 807-813
© 1999 British Society for Rheumatology
Reliability and validity of the EuroQol in patients with osteoarthritis of the knee
St George Hospital/University of NSW, Sydney, Australia
Correspondence to:
M. Fransen, Department of Rheumatology, St George Hospital, Gray Street, Kogarah 2217, Australia.
Objective. To assess the reliability and validity of the EuroQol (EQ-5D) for osteoarthritis of the knee (OA knee).
Methods. Eighty-two patients with OA knee were asked to complete on two occasions, separated by 1 week, the EQ-5D, the Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index and the 36-item short form of the Medical Outcomes Study (SF-36).
Results. In this patient population, <10% of the 243 EQ-5D health states were active. The EQ-5D demonstrated a non-Gaussian distribution. Reliability [intraclass correlation coefficient (ICC)=0.70] is acceptable for aggregate level data. There were significant rank correlations with both the WOMAC and SF-36.
Conclusions. This study provides some evidence of EQ-5D construct validity and reliability. However, the restricted and non-normal distribution of scores, the marked difference between patients' self evaluation and derived societal utility tariffs, as well as the lack of discriminative ability for patients with `moderate' morbidity within each of the five EQ-5D dimensions, are of concern.
KEY WORDS: EuroQol, OA knee, QALY, Utility, WOMAC, SF-36, Health status measures, Health index.
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