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Background: The current study aimed to evaluate the psychometric properties of the Iranian version of the Short Form Health Survey questionnaire (SF-8) using a large sample of elderly in two different groups (diabetes and non-diabetes elderly). Method: 1901 older adults were recruited through a two-level clustered random sampling method, according to WHO STEP guidelines. In order to test reliability, the internal consistency and test_re_test were used. Convergent validity was evaluated by the Average Variance Extracted (AVE) and Composite Reliability (CR) for the entire questionnaire. An independent sample t-test was used to assess the significance of differences across demographic groups. Results: The Cronbach’s alpha for subscales of SF-8 were between 0.79 to 0.85 (physical and mental health). The result of test_re_test indicated appropriate reliability of SF-8. The result of CFA indicated that the 2‐factor model had a good fit to the data for diabetes, non-diabetes groups, and also total participants (GFI=0.983, CFI=0.985, NFI=0.983, IFI=0.985, RMSEA=0.075). The SF-8 also had acceptable convergent and discriminant validity. Conclusion: The present study is the first to confirm the traditional 2-factor structure of SF-8 using a large sample of Iranian older individuals. The results showed that the Iranian version of SF-8 is a reliable and valid tool for measuring HRQOL among Iranian older adults (including diabetes and non-diabetes elderly). |
