Background Currently the age at onset of menarche is earlier than in the past. Nutritional status has an important role in the onset of menarche. Past studies have shown an association between body mass index (BMI) in young girls and earlier onset of menarche. Objective To assess an association between BMI and age at onset of menarche. Methods This cross-sectional study was conducted in young to recruit subjects. After subjects underwent height and weight measurements, we calculated their BMIs. The association between BMI and initial age of menarche was assessed by Chi square test Results Eighty-five subjects participated in this study. There were 44 subjects in the 5 th-85 th subjects with 85 th th th percentile of BMI (obese). All obese subjects Conclusion th percentile had an earlier age at onset of menarche than young girls with lower BMIs.
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