Development and testing of the Diabetes Self-management Instrument: a confirmatory analysis

The purpose of this study was to develop and psychometrically test a new instrument for measuring self-management of adults with type 2 diabetes. Data were collected from 634 diabetic adults recruited from three teaching hospitals in Taiwan. Construct validity was determined by confirmatory factor analysis (CFA). Tests of internal consistency and test-retest were used to assess the reliability of the diabetes self-management instrument (DSMI). Initial results of CFA did not fully support the proposed five-factor model. After the model was modified, the fit indices indicated that this model fits the data best. This model was further cross validated in a second sample. Cronbach's alpha coefficient of the DSMI total scale was .94. The test-retest correlations for the DSMI total scale were acceptable (r = .73, p < .01).