Development of a self-efficacy questionnaire, 'Insulin Therapy Self-efficacy Scale (ITSS)', for insulin users in Japanese: The Self-Efficacy-Q study.

The ITSS is a reliable and valid tool for assessing and quantifying patients' self-efficacy. The ITSS estimation of self-efficacy can predict a patient's glycemic control and future adherence to insulin therapy. These characteristics will ensure the usefulness of the ITSS in ensuring a successful therapeutic process for patients and physicians.