Psychometric properties of the self-care of chronic illness inventory in Chinese older adults with multiple chronic conditions

Background: Existing self-care measures for the Chinese population are specific to single chronic conditions. No generic self-care measures exist for the Chinese population with multiple chronic conditions.Objectives: To test the structural validity, concurrent validity and reliability of the Self-care of Chronic Illness Inventory (SC-CII) in Chinese older adults with multiple chronic conditions.Methods: This cross-sectional study was reported following the Strengthening the Reporting of Observational Studies in Epidemiology guideline. A diverse sample of Chinese older adults with multiple chronic conditions (n = 240) was recruited. Structural validity was assessed with confirmatory factor analysis. Concurrent validity was investigated with hypotheses testing of the relationships between perceived stress, resilience and self-care. Reliability was assessed with Cronbach's alpha and McDonald's omega. Finally, a simultaneous confirmatory factor analysis was conducted to test the general model with all items and all three subscales.Results: Confirmatory factor analysis supported the two-factor structure of the self-care maintenance and self-care management subscales and the one-factor structure of the self-care monitoring subscale. Concurrent validity was supported by the significant negative correlation (r ranged from -0.18 to -0.38, p < .01) with perceived stress and the significant positive correlation (r ranged from 0.31 to 0.47, p < .01) with resilience. Reliability estimates ranged from 0.77 to 0.82 across the three subscales. The simultaneous confirmatory factor analysis did not support the more general model with the combined set of items.Conclusion: The SC-CII is valid and reliable for Chinese older adults with multiple chronic conditions. Future cross-cultural assessment should be conducted to investigate the measurement equivalence of the SC-CII in individuals from Western and Eastern cultural groups.