Additionally, the explanatory power of predictors for self management behavior was 58.0%. This result is even higher than it was in Choi's study (24.1%) [35]. Based on the IMB model, Choi surveyed older patients with type 2 diabetes to investigate the causal relationship between information, motivation, and behavioral skills (but excluded health outcome) [35]. In light of these results, the self-management behavior of young people with type 2 diabetes is more influenced by motivation and behavioral skills compared to older patients. Moreover, Osborn and Egede examined the causal relationship using only three predictorsdinformation, motivation, and self-management behavior (excluding behavioral skill)din their IMB model. They reported that the explanatory power of information and motivation for self management behavior was 17%, which is far lower than the power of this study. This result shows that behavioral skills (self efficacy) are very important to the patients' performance of self management behavior