Effect of motivational interviewing on treatment adherence and self-efficacy of adolescents with asthma: A randomized controlled trial

Aims: This study examined the short- term effect of motivational interviewing on treatment adherence and self-efficacy of adolescents with asthma.Design: The randomized controlled trial.Method: In this study, 72 adolescents with asthma were recruited and assigned to ex-perimental and control groups randomly. In the experimental group, the motivational interviewing was performed for five weekly sessions lasting 80- 90 min. The treatment adherence and self-efficacy questionnaires were completed before the intervention, 2 weeks and 3 months after the intervention in both groups. Data were analysed by Chi-Square test, independent samples T -test, repeated measures of Wilcoxon and generalized estimating equation.Results: The treatment adherence was found to be significantly higher 2 weeks (p = 0.006) and 3 months after the intervention (p = 0.04) in the experimental group than the control group. In addition, the degree of self-efficacy was significantly more in the experimental group 2 weeks (p < 0.001) and 3 months later (p < 0.001) than the control group. The result of generalized estimating equation showed that the inter-vention group had an average of 14.44 more self-efficacy points than the control group (p < 0.001). Also, treatment adherence in the intervention group was signifi- cantly higher than the control group (beta = 6.14, p = 0.05(.Conclusion: This study adds to the evidence for the effectiveness of motivational interviewing in treatment of adolescents with asthma.