Measuring Diabetes Self-Care
A psychometric analysis of the Self-Care Inventory-revised with adults
- Katie Weinger, EDD, RN12,
- Heather A. Butler, PHD, RN1,
- Garry W. Welch, PHD3 and
- Annette M. La Greca, PHD4
- 1Behavioral and Mental Health Research, Joslin Diabetes Center, Boston, Massachusetts
- 2Harvard Medical School, Boston, Massachusetts
- 3Behavioral Medicine Research, Bay State Medical Center, Springfield, Massachusetts
- 4Department of Psychology, University of Miami, Coral Gables, Florida
- Address correspondence and reprint requests to Katie Weinger, EdD, RN, Section on Behavior and Mental Health Research, Joslin Diabetes Center, 1 Joslin Place, Boston, MA 02115. E-mail: katie.weinger{at}joslin.harvard.edu
Abstract
OBJECTIVE—To examine psychometric properties of the Self-Care Inventory-revised (SCI-R), a self-report measure of perceived adherence to diabetes self-care recommendations, among adults with diabetes.
RESEARCH DESIGN AND METHODS—We used three data sets of adult type 1 and type 2 diabetic patients to examine psychometric properties of the SCI-R. Principal component and factor analyses examined whether a general factor or common factors were present. Associations with measures of theoretically related concepts were examined to assess SCI-R concurrent and convergent validity. Internal reliability coefficients were calculated. Responsiveness was assessed using paired t tests, effect size, and Guyatt’s statistic for type 1 patients who completed psychoeducation.
RESULTS—Principal component and factor analyses identified a general factor but no consistent common factors. Internal consistency of the SCI-R was α = 0.87. Correlation with a measure of frequency of diabetes self-care behaviors was r = 0.63, providing evidence for SCI-R concurrent validity. The SCI-R correlated with diabetes-related distress (r = −0.36), self-esteem (r = 0.25), self-efficacy (r = 0.47), depression (r = −0.22), anxiety (r = −0.24), and HbA1c (r = −0.37), supporting construct validity. Responsiveness analyses showed SCI-R scores improved with diabetes psychoeducation with a medium effect size of 0.62 and a Guyatt’s statistic of 0.85.
CONCLUSIONS—The SCI-R is a brief, psychometrically sound measure of perceptions of adherence to recommended diabetes self-care behaviors of adults with type 1 or type 2 diabetes.
- CIDS, Confidence in Diabetes Scale
- PAID, Problem Areas In Diabetes scale
- RSE, Rosenberg Self-Esteem
- SCI, Self-Care Inventory
- SCI-R, SCI-revised
- SCL-90, Symptoms Checklist-90
- SDSCA, Summary of Diabetes Self-Care Activities
Footnotes
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The Self-Care Inventory (SCI) is copyrighted. To request permission to use the SCI, contact A.M.L.G. E-mail: alagreca{at}miami.edu.
A table elsewhere in this issue shows conventional and Système International (SI) units and conversion factors for many substances.
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- Accepted February 20, 2005.
- Received June 11, 2004.
- DIABETES CARE
