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

J Nurs Meas. 2015;23(2):326-35. doi: 10.1891/1061-3749.23.2.326.


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

Methods: 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.

Results: 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.

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

Publication types

  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Adult
  • Diabetes Mellitus, Type 2 / nursing
  • Diabetes Mellitus, Type 2 / prevention & control*
  • Female
  • Humans
  • Japan
  • Male
  • Nursing Assessment
  • Reproducibility of Results
  • Self Care*
  • Surveys and Questionnaires*