Relationships between Factors from the Theory of Planned Behavior, Optimistic Bias, and Fruit and Vegetable Intake among College Students

Verification of a theory of planned behavior model of medication adherence in Korean adults: focused on moderating effects of optimistic or present bias

“…The correlational analysis found that attitudes toward medication adherence and perceived behavioral control were closely related to behavioral intention of medication adherence, but the covariance with medication adherence was behavioral intention. As mentioned in the introduction, studies [20,22] have found that among the variables of TPB, the behavior of perceived behavioral control accounts for the greatest variance in behavior, but in this study, the accountability of the attitude for medication adherence behavior was similar to perceived behavioral control in this regard. It was also shown that attitudes and perceived behavioral control could account for as much variance in medication adherence behavior as behavioral intention of medication adherence.…”

“…In other words, the TPB model for predicting the medication adherence of Korean adults showed significant differences in paths depending on the level of optimistic bias. This result suggested that optimistic bias could moderate the TPB model for health behaviors, particularly medication adherence behavior, beyond the results of previous studies [22,23,30] that found that optimistic bias makes individuals less likely to practice this health behavior. In the present study, for those with weak optimistic bias, attitudes in the TBP model did not directly affect medication adherence but did directly affect perceived behavioral control.…”

“…The participants' optimistic bias against the results of medication noncompliance and unhealthy behavior was measured using modified items from a questionnaire developed by Suh and colleagues [22] based on Weinstein's two questions for measuring optimistic bias [40]. The items were modified to suit the subject matter of this study: "Other people may suffer serious consequences if they do not take prescribed drugs, but there will not be a big problem if I do not do so" and "Even if other people have health problems because they do not practice their health behaviors, I will not have such problems."…”

“…Weinstein [9] assumed that optimistic bias plays a role in adopting disease-preventing behavior and included it as a psychological variable in the precaution adoption process model for health behavior. Although it has not been extensively studied in Korea, some studies [22,23] have found that optimistic bias may influence health behaviors.…”

“…Some empirical studies found that optimistic bias was highly likely to lead to actions exposing the individual to the risk of crime [27], the risk of stock investment failure [28], and the risk of bungee jumping injury [29]. A previous studies [22,23,30] have shown that optimistic bias is a meaningful factor in disease-preventing behavior, this study assumes that it could be a moderator in the TPB model as well as the precaution adoption process model for predicting medication adherence.…”