The purpose of the present study was to investigate the effects of stage-matched intervention against smoking acquisition among junior high school students in thirteen-month follow-up survey. Also, the purpose of this study was to investigate the change of some personal factors by each stage after stage-matched intervention. The participants were 123 students in Japanese junior high school, and they answered the questionnaire regarding their present stage of smoking behavior, knowledge, resistance skills, self-efficacy, and temptation. The education programs included the original leaflet and card that were used not only for knowledge but also for behavioral and cognitive skills through role-plays aimed at the targets of smoking acquisition for each stage. The results of the present study showed that the number of students at precontemplation stage increased significantly from baseline survey to thirteen-month follow-up survey. Furthermore, mean scores of knowledge, skills, and self-efficacy increased from baseline survey to thirteen-month follow-up survey in precontemplation stage. However, there were no significant changes from baseline survey to thirteen-month follow-up survey in contemplation, preparation, and action stages. These results suggested that stage-matched intervention against smoking acquisition would be effective for shift of students to precontemplation stage in Japanese junior high school students.
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