The psychometric properties of the diabetes management self-efficacy scale for patients with type 2 diabetes mellitus

J Adv Nurs. 1999 Aug;30(2):352-9. doi: 10.1046/j.1365-2648.1999.01077.x.


This article summarizes the development and validation of a scale to measure the level of self-efficacy of patients with type 2 diabetes mellitus. Self-efficacy is described as people's belief in their capability to organize and execute the course of action required to deal with prospective situations. This self-efficacy scale was developed based on the self-care activities these patients have to carry out in order to manage their diabetes. The following psychometric properties of this scale were established: content validity, construct validity, internal consistency and stability. The original scale contained 42 items. A panel of five experts in diabetes and four self-efficacy experts evaluated the original scale two times for relevance and clarity. This content validity procedure resulted in a final scale which consisted of 20 items. Subsequently, patients with type 2 diabetes were asked to complete this 20-item scale and further tests were done with the 94 usable responses. Factor analysis identified four factors, all of which were related to clusters of self-care activities used to manage diabetes which comprised this scale. The internal consistency of the total scale was alpha=0.81 and the test-retest reliability with a 5-week time interval was r=0.79 (P < 0.001).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Diabetes Mellitus, Type 2 / nursing
  • Diabetes Mellitus, Type 2 / psychology
  • Diabetes Mellitus, Type 2 / rehabilitation*
  • Factor Analysis, Statistical
  • Female
  • Humans
  • Male
  • Middle Aged
  • Netherlands
  • Nursing Assessment / methods*
  • Psychometrics / methods*
  • Reproducibility of Results
  • Self Efficacy*