The aim of this research was to determine the relationship between body mass index (BMI) and the menstrual cycle in adolescents at STIKARA SINTANG. The menstrual cycle is a clinical sign of female reproductive function. Menstruation is a complex process involving several hormones, sexual organs, and the nervous system. Body mass index is very influential on menstrual disorders because if a person experiences certain hormonal changes which are marked by a marked decrease in body weight (underweight, BMI < 18.5). The test used was the Chi-square test so the results were (p=0.05, pvalue =0.015), meaning there was a significant relationship between BMI and the menstrual cycle.
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