The effect of a transtheoretical model–based motivational interview on self-efficacy, metabolic control, and health behaviour in adults with type 2 diabetes mellitus: A randomized controlled trial

Aim: This study aimed to determine the effect of a transtheoretical model–based motivational interview method on self-efficacy, metabolic control, and health behaviour in adults with type 2 diabetes mellitus. Methods: A randomized controlled study design was used. The study was conducted with 50 individuals with type 2 diabetes mellitus, divided into an intervention group and a control group. The researcher held motivational interviews with the patients in the intervention group. Both groups were observed at the beginning of the study and 6 months after the baseline interview. The study data were collected between January 8 and November 18, 2014. Results: Comparing the intervention and the control groups, the differences in the level of self-efficacy and participants' metabolic values were significant (P <.05). The number of participants in the action stage of the intervention group for nutrition, exercise, and medication use significantly increased compared with the control group (P <.05). Conclusion: The transtheoretical model–based motivational interview method increased the self-efficacy level of participants with type 2 diabetes mellitus, which helped them improve their metabolic control and health behaviour stages over this 6-month period.