Reliability and validity of European Quality of Life 5 Dimension (EQ-5D) for measuring health-related quality of life in knee osteoarthritis patients at Cipto Mangunkusumo General Hospital

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Abstract

Background: Quality of life is very important to knee osteoarthritis (OA) patients. The term quality of life denotes one that is health-related. One of the questionnaires most frequently used to measure the quality of life is the European Quality of Life 5-Dimension (EQ-5D) questionnaire. At Cipto Mangunkusumo General Hospital, until today there has not been any instrument for measuring the health-related quality of life in knee OA patients that has been tested for its reliability and validity.Objective: To prove the reliability and validity of EQ-5D as a measurement tool in determining the healthrelated quality of life in knee OA patients at Cipto Mangunkusumo General Hospital.Methods: This is a validity study in which all patients were asked to complete both the EQ-5D form and 36- item short form (SF-36) on their fi rst visit. They were subsequently asked again to complete only the EQ-5Dform one week after their fi rst visit.Results: Data were obtained from 86 respondents.The value of the intraclass correlation coeffi cient of each EQ-5D dimension, EQ-5D index, and visual analogue scale (VAS) was excellent (>0.75). Cronbach’s α value for internal consistency reliability in this study was0.6772 (<0.7). The external validity of EQ-5D compared to SF-36 was analyzed with the Pearson’s correlation test and revealed a signifi cant correlation (p<0.01) of all EQ-5D dimensions, EQ-5D index, and EQ-5D VAS with total score of SF-36 except for the dimensions of self-care, pain, and anxiety/depression. The construct validity of EQ-5D showed that all of the dimensions were signifi cantly correlated with the EQ-5D index (p<0.01) except for self-care dimension.Conclusion: EQ-5D is a valid and reliable measurement tool. It is thus recommended for measuring the healthrelated quality of life in knee OA patients at CiptoMangunkusumo General Hospital.
Original languageEnglish
JournalIndonesian Journal of Rheumatology
Publication statusPublished - 2010

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