Early pregnancy among adolescents remains a reproductive health issue that impacts physical, psychological, and social health. One preventative measure is through adolescent reproductive health education. This study aims to determine the effect of reproductive health education on increasing adolescent knowledge as a preventative measure for early pregnancy. The study used a pre-experimental design with a one-group pretest-posttest approach. The sample consisted of 50 adolescents at Senior High School X, selected using a purposive sampling technique. The research instrument was a reproductive health knowledge questionnaire. Data were analyzed using univariate analysis and simple statistical tests. The results showed an increase in adolescent knowledge after receiving reproductive health education. The conclusion of this study is that reproductive health education is effective as a preventative measure for early pregnancy in adolescents.
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