[[abstract]]The purpose of this study was to investigate junior high school students’ helmet-wearing behavioral intention and related factors of riding bicycles on the basis of both the Theory of Reasoned Action of Ajzen and Fishbein (1980) and the Self-efficacy of Bandura's Social Learning Theory. By using stratified cluster sampling method, the 382 samples were selected from the students who studied in the public junior high schools in Zhongli City, Taoyuan County in 2005. A structured questionnaire was used to collect the data for this study. The main findings of this study were as follows: 1.About 40﹪samples had positive behavioral intention to wear helmets when riding bicycles；but other 40﹪samples showed negative intentions. 2. The attitude and subjective norm could effectively explain 36.94﹪of variance of the intention of wearing helmets; self-efficacy added 20.08﹪ explanation power. Thus, the explanation power of these three variables accounted for 57.02%. The sort of the importance was self-efficacy, attitude, and subjective norm. 3. The attitudes of the samples toward helmet-wearing were significantly positively related to the product of behavioral beliefs multiplied by evaluations of outcomes (ΣBi＊Ei). Also, the subjective norm of the samples toward helmet-wearing were also significantly positively related to the product of normative beliefs multiplied by motivations to comply(ΣNBj＊MCj). 4. There were significant differences between samples with or without the intention of helmet-wearing in behavioral beliefs, evaluations of outcomes, normative beliefs, motivations to comply, and self-efficacy. 5. The variables of ‘gender’, ‘grade’, ‘the experiences of helmet-wearing’, ‘the experiences of traffic accidents’ couldn’t affect samples’ intention of helmet-wearing. 6. The results of this study supported the framework, an integration of Theory of Reasoned Action and Self-efficacy.
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