<![CDATA[Early marriage remains a public health issue that adversely affects adolescents' reproductive health, education, psychological well-being, and socioeconomic conditions. One preventive approach is peer support group-based education, which utilizes the role of peers to improve adolescents' knowledge, foster positive attitudes, and strengthen their self-efficacy. Objective To determine the effect of peer support group-based early marriage prevention education on adolescents' knowledge, attitudes, and self-efficacy at Taman Siswa Sukadamai Vocational High School, Asahan Regency. This study employed a quantitative approach using a quasi-experimental design with a pretest-posttest control group design. The sample consisted of 130 adolescents, including 65 respondents in the experimental group and 65 respondents in the control group. The experimental group received peer support group-based education, while the control group received education using PowerPoint presentations. Data were analyzed using univariate and bivariate analyses with the Mann-Whitney test. Results the characteristics of respondents in both the experimental and control groups were homogeneous. The Mann-Whitney test revealed significant differences between the experimental and control groups in terms of knowledge (p = 0.001), attitudes (p = 0.001), and self-efficacy (p = 0.001). Peer support group-based early marriage prevention education was found to be more effective than conventional educational methods in improving adolescents' knowledge, fostering positive attitudes, and enhancing self-efficacy. Conclusion peer support group-based early marriage prevention education had a significant effect on improving adolescents' knowledge, attitudes, and self-efficacy at Taman Siswa Sukadamai Vocational High School, Asahan Regency. This educational approach can be considered an effective strategy for promoting adolescent reproductive health in the school setting.]]>
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