Psychometric Assessment of the Depressive Cognition Scale Among Older Chinese People
The study aimed to translate the Depressive Cognition Scale (DCS) into Chinese and to test its reliability and validity among Chinese older people. Using a cross-sectional design, a demographic questionnaire and Chinese versions of the Depressive Cognition Scale (DCS-CHI) and the Center for Epidemiological Studies-Depression Scale (CES-D) were administered. The sample consisted of 1673 older people who were from communities and hospitals. The Cronbach's alpha (α) of DCS-CHI was 0.91, and the test-retest correlation coefficient was 0.91 (95% CI, 0.86–0.95, p < 0.001). The Content Validity Index (CVI) was found to be good. Exploratory factor analysis (EFA) resulted in a single factor that explained 58.46% of the total variance and all 8 items had strong factor loadings ranging from 0.62 to 0.83; confirmatory factory analysis (CFA) indicated all measurements of the structural model exceeded the recommended criteria, and the single factor solution of DCS-CHI had a good fit (χ2/df = 2.45, GFI = 0.99, AGFI = 0.97, CFI = 0.99, TLI = 0.99, RMSEA = 0.04, RMR = 0.01, PCLOSE = 0.79). The strong correlation of 0.81 (p < 0.01) between the DCS-CHI and CES-D suggested good concurrent validity. Specifying the CES-D as the criterion, the area under the receiver operator characteristic (ROC) curve of the DCS-CHI for the optimal cut-point was 0.941(95%CI:0.919–0.963, p = 0.000), the sensitivity and the specificity were 84.7% and 90.7% respectively, suggesting good predictive validity. The findings support the reliability and validity of the DCS-CHI as a measure of depressive cognitions that typically proceed more serious depressive symptoms among Chinese older adults.