title: Development and validation of the Diabetes Medication System Rating Questionnaire-Short Form.
abstract: OBJECTIVE
  To develop and validate a short form of the 54-item Diabetes Medication System Rating Questionnaire that maintains the domains and performance characteristics of the long-form questionnaire.
  
  
  METHODS
  Data from the Diabetes Medication System Rating Questionnaire validation study were analysed to select items representing the nine scales (convenience, negative events, interference, self-monitoring of blood glucose burden, efficacy, social burden, psychological well-being, treatment satisfaction and treatment preference). The resulting 20-item Diabetes Medication System Rating Questionnaire Short-Form was administered online, with validated criterion measures of treatment satisfaction and medication adherence, with a retest within 2 weeks. Participants were US adults (N = 413) with Type 2 diabetes using oral agents alone; insulin by syringe and/or pen with or without oral agents; or glucagon-like peptide-1 agents. Most participants (82%) completed the retest.
  
  
  RESULTS
  The median inter-item agreement of scales was 0.76 and the total composite (mean of all items except treatment preference) was 0.88. The median test-retest reliability of scales was 0.86, and of the total composite was 0.95. All statistically significant correlations between Diabetes Medication System Rating Questionnaire Short-Form scales and criterion measures of treatment satisfaction and adherence were in the expected direction. The median correlation of the Diabetes Medication System Rating Questionnaire Short-Form with corresponding criterion measures of treatment satisfaction was 0.59; the mean correlation of the same Diabetes Medication System Rating Questionnaire Short-Form measures with adherence was 0.42. The Diabetes Medication System Rating Questionnaire Short-Form scales were more powerful predictors of adherence than were the criterion measures of treatment satisfaction. The Diabetes Medication System Rating Questionnaire Short-Form scales differentiated between those taking different medications and between those using different insulin delivery devices.
  
  
  CONCLUSIONS
  This study suggests that the Diabetes Medication System Rating Questionnaire Short-Form provides a comprehensive set of measures with acceptable reliability and validity and a reduced burden of administration.
authors.affiliation: Department of Sociology, Loyola University Maryland, Baltimore, MD, USA.
authors.forename: M
authors.initials: M
authors.lastname: Peyrot
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: R R
authors.initials: RR
authors.lastname: Rubin
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015190:Blood Glucose Self-Monitoring; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000188:drug therapy*; D016503:Drug Delivery Systems / Q000009:adverse effects; D004359:Drug Therapy, Combination / Q000009:adverse effects; D005260:Female; D019538:Health Care Surveys; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D054795:Incretins / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D007279:Injections, Subcutaneous; D007328:Insulin / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D008297:Male; D055118:Medication Adherence; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000379:methods*; D017060:Patient Satisfaction; D015203:Reproducibility of Results; D014481:United States
chemical_list: D007004:Hypoglycemic Agents; D054795:Incretins; D007328:Insulin