Objective. This study was conducted to determine the effects of a school-based intervention program on the smoking-related knowledge, attitude, self-efficacy, and practices among students aged 11 to 17 years in Indonesia.
Methods. Using quasi-experimental design, the study was conducted among 690 Indonesian adolescent students aged 11 to 17 years who are in Grades 7 and 8 in West Java Province, Indonesia and have identified themselves as either daily smoker or non-smoker. This research involved two intervention groups, and one control group.Data were collected using self-administered questionnaires and analyzed through One Way ANOVA of Dependent Groups/Within Subjects and Independent Group/Between Subjects using STATA 12.0.
Results. Health education intervention affected the knowledge, attitude, self-efficacy, and practice positively either in Intervention 1and2 Groups. In the Control Group, slight behavior changes were observed due to factors of school policy. Meanwhile, the knowledge, attitude, self-efficacy, and practice were found to increase linearly in Intervention 1 Group.
Conclusion. The study found that the strategies of Intervention 1 group were found to be effective for linearly improving the knowledge, attitude, and self-efficacy compared to other groups.
Key words: school-based intervention, smoking prevention, adolescents.
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