Cross-Cultural Adaptability and Psychometric Validation of the Treatment Self-Regulation Questionnaire (TSRQ) for Application on the Persian-Speaking Type 2 Diabetes Patients.

Purpose: Autonomous self-regulation is a proxy for adapting to long-term healthy behaviors and has a key impact on the prevention of chronic illnesses. The psychometric properties of the Treatment Self-Regulation Questionnaire-Persian Version (TSRQ-P) were assessed in this study to examine different types of self-regulation among Iranian type 2 diabetes patients. Patients and Methods: A preliminary draft of the TSRQ-P was prepared based on a standard translation/back-translation procedure and appraisal of the face and content validities by 15 allied health specialists. The internal consistency measure of Cronbach's alpha and Intraclass Correlation Coefficient (ICC) were estimated to verify the content validity and reliability of the TSRQ-P. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were performed to check the scale's structural components. Results: The calculated Cronbach's alpha= 0.893 and ICC= 0.982 deemed the scale to be appropriate, in terms of internal consistency and measurement invariance. The EFA and CFA outputs yielded two distinct factor structures for TSRQ-P [(N=189) (RMSEA=0.078, NFI=0.849, RFI=0.806, IFI=0.913, TLI=0.886, and CFI= 0.911)]. Conclusion: The TSRQ-P has robust psychometric features for application to Persian-speaking patients with type 2 diabetes. Owing to the cross-border cultural diversity of the subgroups of Persian-speaking populations, further psychometric scrutiny is recommended to prevent bias and sociolinguistic inconsistencies.