Reliability and Validity of a Shortened Version of an Instrument for Diabetes Self-Care Agency

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The purpose of this study was to develop a shortened version of the Instrument of Diabetes Self-Care Agency (IDSCA).


In the development of the shortened version of IDSCA, intraclass correlation coefficient 2 (ICC2) analysis was done to determine items to be deleted. However, the 7 subscales were retained. The shortened IDSCA was evaluated for internal consistency, reproducibility, concurrent validity, criterion-related validity, and goodness of fit.


The shortened IDSCA included 35 items addressing 7 subscales. High ICC2 (.804) and a high Cronbach's alpha (.89) indicate internal consistency and reproducibility. A high correlation (.62) between the shortened version of the IDSCA and the Self-Care Agency Questionnaire indicated concurrent validity.


The shortened IDSCA provides a reliable and valid measure of self-care agency of individuals with diabetes.

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