Treatment self-regulation questionnaire across three self-care behaviours: An instrument validation study in Iranian patients with type 2 diabetes mellitus.

Content validity was confirmed for Persian TSRQ-15. A three-factor structure was revealed, in which external regulation and introjected regulations were validated, while amotivation and autonomous failed to show discriminant validity. Internal consistency was sound, and concurrent validity was approved. The Persian version of TSRQ-15 was shown to be a valid and reliable tool for assessing motivation behind the practice of healthy diet, exercise and medication-use/glucose-monitoring in people with type 2 diabetes.