title: Measuring diabetes self-care: a psychometric analysis of the Self-Care Inventory-Revised with adults.
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.
  
  
  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 alpha = 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 HbA(1c) (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.
authors.affiliation: EdD, Section on Behavior and Mental Health Research, Joslin Diabetes Center, 1 Joslin Place, Boston, MA 02115. katie.weinger@joslin.harvard.edu
authors.forename: Katie
authors.initials: K
authors.lastname: Weinger
authors.forename: Heather A
authors.initials: HA
authors.lastname: Butler
authors.forename: Garry W
authors.initials: GW
authors.lastname: Welch
authors.forename: Annette M
authors.initials: AM
authors.lastname: La Greca
mesh_terms: D000328:Adult; D003920:Diabetes Mellitus / Q000523:psychology / Q000534:rehabilitation*; D015438:Health Behavior; D006801:Humans; D010353:Patient Education as Topic; D011594:Psychometrics; D015203:Reproducibility of Results; D012648:Self Care