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Psychometric Properties of the Abbreviated Version of the Health-Related Quality of Life (SF-8) Among Diabetes and Non-Diabetes Iranian Old People


 BackgroundThe current study aimed to evaluate the psychometric properties of the Iranian version of SF-8 using a large sample of elderly in two different groups (diabetes and non-diabetes elderly).Method1901 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 Pittsburgh Sleep Quality Index [PSQI). An independent sample t-test was used to assess the significance of differences across demographic groups.FindingsThe Cronbach for SF-8 and its subscales were between 0.79 to 0.85 (physical and mental health). 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 and non-diabetes groups of older people (GFI=0.936, CFI=0.940, NFI=0.938, IFI=0.941,RMSEA=0.1). The SF-8 also had acceptable convergent validity.ConclusionThe 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).