Psychometric characteristics of the WHOQOL-SRPB Scale in a population of stroke survivors and caregivers

Purpose Studies have shown that spirituality plays an important role in enhancing the quality of life of stroke survivors and their caregivers. Spirituality has been associated with positive patient and caregiver outcomes, so a valid, reliable measure of spirituality is important. It has not been tested with stroke survivors and their caregivers, so the aim of this study was to evaluate the validity and reliability of the World Health Organization Quality of Life Spiritual Religious and Personal Belief (WHOQOL-SRPB) scale for stroke survivors and their caregivers. Methods In this cross-sectional study, 414 stroke survivors at 10 rehabilitation hospitals and 244 caregivers completed the WHOQOL-SRPB. The WHOQOL-SRPB's factorial structure was assessed with confirmatory factor analysis (CFA), criterion-related validity was evaluated with the WHOQOL-BREF, and internal consistency reliability was assessed with Cronbach's alpha and ordinal alpha. Results The CFA results supported the hypothesized eight-factor structure. The stroke survivor and the caregiver versions of the model both had excellent fit indices. The factor loadings for the final models were strong: 0.78-0.98 for stroke survivors and caregivers (p < 0.001). The criterion-related validity for the WHOQOL-SRPB showed weak to moderate correlations with all the WHOQOL-BREF dimensions. Both ordinal alpha and Cronbach's alpha had values more than 0.70. Conclusions The WHOQOL-SRPB scale is a valid, reliable instrument for measuring spirituality in stroke survivors and caregivers. Given the importance of spirituality for stroke survivors and caregivers, the WHOQOL-SRPB scale is recommended as an important tool for clinical practice and research.