The 12-item medical outcomes study short form health survey version 2.0 (SF-12v2): a population-based validation study from Tehran, Iran

Abstract

BackgroundThe SF-12v2 is the improved version of the SF-12v1. This study aimed to validate the SF-12v2 in Iran.MethodsA random sample of the general population aged 18 years and over living in Tehran, Iran completed the instrument. Reliability was estimated using internal consistency and validity was assessed using known-groups comparison and convergent validity. In addition the factor structure of the questionnaire was extracted by performing both exploratory and confirmatory factor analyses (EFA and CFA).ResultsIn all, 3685 individuals were studied (1887male and 1798 female). Internal consistency for both summary measures was satisfactory. Cronbach's α for the Physical Component Summary (PCS-12) was 0.87 and for the Mental Component Summary (MCS-12) it was 0.82. Known-groups comparison showed that the SF-12v2 discriminated well between men and women and those who differed in age and educational status (P < 0.05). Furthermore, as hypothesized the physical functioning, role physical, bodily pain and general health subscales correlated higher with the PCS-12, while the vitality, social functioning, role emotional and mental health subscales correlated higher with the MCS-12. Finally the exploratory factor analysis indicated a two-factor structure (physical and mental health) that jointly accounted for 59.9% of the variance. The confirmatory factory analysis also indicated a good fit to the data for the two-latent structure (physical and mental health).ConclusionAlthough the findings could not be generalized to the Iranian population, overall the findings suggest that the SF-12v2 is a reliable and valid measure of health related quality of life among Iranians and now could be used in future health outcome studies. However, further studies are recommended to establish its stability, responsiveness to change, and concurrent validity for this health survey in Iran.

Psychometric Properties of the Brazilian 12-Item Short-Form Health Survey Version 2 (SF-12v2)

“…The mental and physical health subscales were positively and moderately associated. This result corroborates previous findings suggesting the interconnection between physical and mental health, and more precisely, between the PCS and MHS factors of the SF scales (Hobart, Williams, Moran, & Thompson, 2002;Montazeri et al, 2011;Simon, Revicki, Grothaus, & Vonkorff, 1998). Both PCS and MCS subscales also presented adequate convergent validity with the external measures (SHS, SWLS, GHQ-12, and ASAS-R).…”

“…Alpha reliabilities were also adequate and similar to previous studies (Cheak-Zamora, Wyrwich, & McBride, 2009;De Smedt et al, 2013;Montazeri et al, 2011). Although the factor loadings and alpha reliability were adequate, a confirmatory factor analysis evaluation of the SF-12v2 provided non-acceptable fit indices.…”

Quality of life, work ability and other important indicators of women’s occupational health

“…health summary score ranged 4-73. These factors were based on the median (Me), divided into 2 groups of high and low HRQoL [18]. In addition to the mentioned measures, socio-demographic characteristics were also measured and addressed as potential confounders in the multivariate analysis.…”

Reliability and validity of 12-item Short-Form health survey (SF-12) for the health status of Chinese community elderly population in Xujiahui district of Shanghai

“…The GFI, NFI, and CFI values ranged from 0 to 1 and a value of [0.90 represented a satisfactory model fit [26]. A RMSEA of \0.05 was suggested as an indicator of close fit [27].…”

“…Convergent and discriminant validity were tested using the correlation between item and subscale or summary (PCS or MCS) scores with Spearman's correlation coefficient (q) [27,28]. The correlation coefficients between item and subscale or summary score C0.4 were satisfied for convergent validity.…”