title: The psychometric properties of the diabetes management self-efficacy scale for patients with type 2 diabetes mellitus.
abstract: 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).
authors.affiliation: Department of Nursing Science, University of Utrecht and Hogeschool van Utrecht, Utrecht, The Netherlands.
authors.forename: J V
authors.initials: JV
authors.lastname: Bijl
authors.forename: A V
authors.initials: AV
authors.lastname: Poelgeest-Eeltink
authors.forename: L
authors.initials: L
authors.lastname: Shortridge-Baggett
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003924:Diabetes Mellitus, Type 2 / Q000451:nursing / Q000523:psychology / Q000534:rehabilitation*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D009730:Nursing Assessment / Q000379:methods*; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D020377:Self Efficacy