Abstract
This study aimed to assess the validity and reliability of the mental component summary (MCS) and physical component summary (PCS) of SF-12. 140 Iranian elderly aged 60 years and older from the general population (100 male vs 40 female) of the Shiraz city were recruited by convenient sampling. The questionnaire on quality of life (SF-12, two dimensions: the physical component α = 0.68; and the mental component α = 0.71) was used to collect the data analyzed with the AMOS software. According to the structural equation model (SEM), four subscales of SF-12 (emotional role, social function, vitality and mental health) can predict mental component summary (respectively: coefficient = 0.65, 0.57, 0.78 and 0.90) and four subscales of SF-12 (general health, physical function, bodily pain and physical role) can predict physical component summary (respectively: coefficient = 0.58, 0.70, 0.74 and 0.88). The goodness-of-fit indices showed that the model for predicting mental and physical components in the elderly was excellent (X2 / df = 1.61, RMSEA= 0.07, CFI = 0.96 and NFI=0.92).
Highlights
Ageing leads to a higher probability of health complaints
Fit indices showed that the measurement model of SF-36 and SF-12 has an excellent fit with root mean square error of approximation (RMSEA)
The emotional, social function, vitality, and mental health subscales of QOL correlate with the mental component summary (MCS) (r= 0.46**, 0.63**, 0.79** and 0.89**, reactively) and general health, physical function, bodily pain and physical role subscales of QOL were related to the physical component summary (PCS) (r= 0.63**, 0.75**, 0.78** and 0.78**, respectively)
Summary
Ageing leads to a higher probability of health complaints. Though, the consequences of these ailments could be prevented, in case the quality of life and health-related conditions of older people would be considered (Borglin, Jakobsson, Edberg, & Hallberg (2005). medical, social and psychological problems could decrease elderly people activities and subsequently result in diminished healthrelated quality of life (HRQOL) (Canbaz, SÜNTER, Dabak, & PEKŞEN, 2003). In order to assess the mental and physical components of the health of the elderly, valid and reliable instruments are required. SF-12 is a validated measurement to assess the HealthRelated Quality of Life (HRQoL), which includes two dimensions: a physical component summary (PCS, six items) and a mental component summary (MCS, six items) (Andrade, Andrade, de Oliveira Duarte, & de Andrade, 2020). Based on structural equation modelling, factor coefficients showed that PCS and MCS components are more reliably aligned with the primary subscales of the SF-36. By using structural equation modelling (SEM), validating of SF-12 measurement based on Iranian population data were tested. The purpose of the present study is to validate the mental and physical component of SF-12 in the elderly people
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