Abstract
Background and objectiveQuality of life (QoL) is a multi-dimensional concept and its assessment is one of important themes of care for older people. Assessing QoL in older people needs specific scales. The aim of this study was to culturally adapt and investigate the psychometric properties of the Persian version of brief Older People’s Quality of Life questionnaire (OPQOL-brief) in an Iranian older population.MethodsThis methodological cross-sectional study was conducted among 525 Persian-speaking older people (aged 60 and over), living in Isfahan, Iran. Translation of the OPQOL-brief questionnaire was performed using forward–backward method. Test–retest reliability was evaluated through Intra Class Correlation (ICC) coefficient and internal consistency by using Cronbach’s α. Construct validity was investigated by using exploratory factor analysis (EFA), confirmatory factor analysis (CFA), and Latent class analysis (LCA). Criterion, convergent and discriminant validities were also assessed.ResultsPersian version of the OPQOL-brief showed good test–retest reliability (ICC = 0.842, 95% CI = 0.73–0.91; P < 0.001). Persian OPQOL-brief scale demonstrated high internal consistency (Cronbach’s α = 0.83). It showed good discriminant validity and differentiated old patients from healthy older individuals (P < 0.001). Construct validity based on EFA led to extraction of three dimensions (“socioeconomic”, “emotional”, and “physical” well-being) and the CFA confirmed the adequacy of extracted construct from EFA (CFI = 0.909, PCFI = 0.52, PNFI = 0.5, CMIN/DF = 3.012, and RMSEA = 0.08). LCA classified participants into three classes in terms of QoL level (low (16%), middle (67%), and high (17%)). Criterion validity and convergent validity revealed significant positive correlations between OPQOL-brief and physical and psychological dimensions of the SF-36.ConclusionThe Persian version of the OPQOL-brief is a reliable and valid instrument for assessing QoL with applicability in a broad range of older Persian language population.
Highlights
The world’s ageing population is growing dramatically as a result of longer life expectancy, improved living conditions and reduced fertility rates [1, 2]
A bit more than half (54.2%) of the participants reported that they suffered from hypertension, and 30% suffered from cardiovascular disease
Results of the Latent class analysis (LCA) for classifying participants based on the 13 items showed that model with three classes has highest quality of fit to the data (BIC = 4236.7, Akaike’s information criterion (AIC) = 6022.01, SABIC = 5579.34 and entropy = 0.84)
Summary
The world’s ageing population is growing dramatically as a result of longer life expectancy, improved living conditions and reduced fertility rates [1, 2]. According to the statistical data from population and housing census in 2011, Iran had 8.2% of people aged ≥ 60 years, and predicted that this rate will increase to 25.1% in 2061 [1, 4, 5]. The increase in the ageing population and corresponding rises in chronic illness is one of the most important public health challenges in the high-income. Feizi and Heidari Health Qual Life Outcomes (2020) 18:327 countries [1, 6, 7] It is associated with higher demand for, expenditure on, health and aged care services [8, 9]. Quality of life (QoL) is a multi-dimensional concept and its assessment is one of important themes of care for older people. The aim of this study was to culturally adapt and investigate the psychometric properties of the Persian version of brief Older People’s Quality of Life questionnaire (OPQOL-brief ) in an Iranian older population
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