Turkish validation of a new scale from older people’s perspectives: Older people’s quality of life-brief (OPQOL-brief)

Abstract

IntroductionThere are various ‘quality of life’ scales developed for older people. Although quality of life is a subjective concept, most of these scales are based on expert opinions rather than perspectives of older people. The aim of this study is to evaluate validity and reliability of Older People’s Quality of Life-brief scale (OPQOL-brief), which is based on perspectives of older people, in Turkish population. MethodsA cross-sectional study was implemented in a Geriatric medicine outpatient clinic. Total number of 168 older patients who speak in Turkish fluently were recruited. Comprehensive geriatric assessment and OPQOL-brief was applied to all participants together with another quality of life scale validated in Turkish population, CASP-19 (Control, Autonomy, Self-realization, Pleasure). Validity was evaluated with construct validity, convergent validity and discriminant validity. Reliability was assessed with internal consistency and test-retest reliability. ResultsMean age of the study population was 73.3 ± 5.9 years. Female participants were 64.9% (n = 109). Internal consistency was assessed by Cronbach’s α coefficient. OPQOL-brief scale demonstrated high internal consistency (Cronbach’s α = 0.876). Test-retest reliability was assessed by interclass correlation coefficient (ICC) and showed high reliability (ICC = 0.98, 95%CI = 0.96-0.99, p < 0.001). Strong and significant correlation was detected between OPQOL-brief and CASP-19 scales (r = 0.763, p < 0.001). ConclusionTurkish version of OPQOL-brief has acceptable validity and reliability in Turkish population. The scale can be used to measure quality of life of older people.