Psychometric analysis of the Treatment Self-Regulation Questionnaire-Persian (TSRQ-P) version: autonomous regulation appraisal among the Iranian type 2 diabetes patients

Abstract Background: Autonomous self-regulation is a proxy for adapting long-term healthy behaviors with major impact on prevention of chronic illnesses. The psychometric properties of the Treatment Self-Regulation Questionnaire- Persian version (TSRQ-P) was assessed in this study for use in examination of autonomous regulation among the Iranian type 2 diabetes patients. Methods: The preliminary draft of the TSRQ-P was prepared based on a standard translation/back translation procedure and 15 allied health specialists assessed its face and content validities. The internal consistency measure of the Cronbach’s alpha and Intraclass Correlation Coefficient (ICC) were estimated to verify the TSRQ-P’s content validity and reliability. The exploratory (EFA) and confirmatory factor (CFA) analyses were performed to check the scale’s structural components. Results: The calculated Cronbach’s alpha= 0.893 and ICC= 0.982 deemed the scale as content valid and acceptable in terms of measurement invariance. The EFA and CFA outputs yielded two distinct factor structure for the TSRQ-P (RMSEA=0.078, NFI=0.849, RFI=0.806, IFI=0.913, TLI=0.886, CFI= 0.911). Conclusion: The TSRQ-P indicated robust psychometric features for application among Persian-speaking type 2 diabetes patients. Due to cross-borders cultural diversity of the subgroups of Persian speaking populations, further psychometric scrutiny is recommended to prevent bias and sociolinguistic inconsistencies.