title: Psychometric properties of the Greek Diabetes Treatment Satisfaction Questionnaire.
abstract: OBJECTIVE
  Measurement of treatment satisfaction in diabetes is important as it has been shown to be associated with positive outcomes, reduced disease cost and better health. The aim of this study was to assess the construct validity and internal consistency reliability of the Greek version of the Diabetes Treatment Satisfaction Questionnaire (DTSQ).
  
  
  METHODS
  A sample of type II diabetes patients (N = 172) completed the DTSQ status version, the SF-36 health survey and also provided data regarding treatment method, clinical and socio-demographic status. Instrument structure, reliability (Cronbach's a) and construct validity (convergent, discriminative, concurrent and known-groups) were assessed.
  
  
  RESULTS
  The DTSQ measurement properties were confirmed in the Greek version with confirmatory factor analysis (CFA). Scale reliability was high (Cronbach's a = 0.92). Item-scale internal consistency and discriminant validity were also good, exceeding the designated success criteria. Significant correlations were observed between DTSQ items/overall score and SF-36 scales/component scores, which were hypothesized to measure similar dimensions. Known groups' comparisons yielded consistent support of the construct validity of the instrument.
  
  
  CONCLUSIONS
  The instrument was well-accepted by the patients and its psychometric properties were similar to those reported in validation studies of other language versions. Further research, incorporating a longitudinal study design, is required for examining test-retest reliability and responsiveness of the instrument, which were not addressed in this study. Overall, the present results confirm that the DTSQ status version is a reasonable choice for measuring diabetes treatment satisfaction in Greece.
authors.affiliation: Faculty of Social Sciences, Hellenic Open University, Patras, Greece. nkontodi@otenet.gr
authors.forename: Nick
authors.initials: N
authors.lastname: Kontodimopoulos
authors.forename: Eleni
authors.initials: E
authors.lastname: Arvanitaki
authors.forename: Vassilis H
authors.initials: VH
authors.lastname: Aletras
authors.forename: Dimitris
authors.initials: D
authors.lastname: Niakas
mesh_terms: D000367:Age Factors; D000368:Aged; D001786:Blood Glucose / Q000032:analysis; D003430:Cross-Sectional Studies; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis / Q000188:drug therapy* / Q000523:psychology*; D005260:Female; D006115:Greece; D019538:Health Care Surveys; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use*; D007328:Insulin / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000592:standards / Q000639:trends; D015999:Multivariate Analysis; D017060:Patient Satisfaction / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000295:instrumentation; D011788:Quality of Life; D012044:Regression Analysis; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D012737:Sex Factors; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
chemical_list: D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007328:Insulin