Validity and reliability of the Arabic version of the "Personal Wellbeing Index-Adults" on adults with hearing impairment.

The Personal Wellbeing Index-Adults (PWI-A) is the most widely used instrumentfor measuring subjective-quality of life (QoL). The current study seeks to investigate the constructvalidity and reliability of the Arabic version of the PWI-A on adults with bilateral hearingimpairment by comparing the single-factor solution with the two-factor solution. A cross-sectional study was conducted at the Audio-Vestibular Medicine Unit of Alexandria University from July-2017 to January-2018. A total of 205 adults were interviewed tomeasure the subjective-QoL using the PWI-A instrument. Internal consistency was determinedusing both Cronbach's alpha and composite reliability (CR). Validity was assessed by constructvalidity, including ordinal regression, ordinal exploratory factor analysis (OEFA), and ordinalconfirmatory factor analysis (OCFA). The first four items of the PWI-A which are: satisfaction with living standard, health,achievements, and relationships were the most important indicators of subjective-wellbeing(Part r 0.0547, 0.0324, 0.0361, and 0.0225, respectively). OEFA suggested that the two-factormodel contributes better than the single-factor model. OCFA validated this suggested solution;(two-factor: RMSEA=0.084 (90% CI=0.01-0.14); CFI=0.964; AIC=52.64; single-factor: RMSEA=0.119 (90% CI=0.07-0.17); CFI=0.922; AIC=62.77). Good internal consistency wasalso presented (two-factor: Cronbach's alpha=0.719, 0.693; single-factor: Cronbach's alpha =0.750). The Arabic version of the PWI-A is a multidimensional scale that consists of twodimensions: the first is related to subjective-QoL, and the second is related to satisfaction withthe community. Thus, it is recommended to use the short version of the PWI-A with only fouritems to measure subjective-QoL, as it achieved sufficient reliability and construct validity.