Introduction: menarche is a remarkable phenomenon during the stages of female puberty. Predicting the correct time of puberty in girls makes it possible to provide them with the necessary knowledge in this field.

Method: This cross-sectional study was performed on 400 middle school girls 11 to 14 years of age in Birjand using interviews and anthropometric measurement methods. Samples were selected by two-stage random sampling. The data collection tool was a questionnaire including demographic characteristics, the age of menarche, and anthropometrics. The content validity of the questionnaire was confirmed by several faculty members and its reliability was confirmed using retesting and calculating Cronbach's alpha coefficient. Data were analyzed using SPSS software and independent t-test, analysis of variance and Pearson correlation coefficient were used, and p≤0.05 was considered as a significant level.

Results: Based on the findings of this study, the mean age of menarche in Birjand was 12.13±1.19 years. The mean body mass index was 20.3±3.8 kg/m2. A significant relationship was found between menarche age and body mass index (p≤0.001). In other words, girls with normal body mass experience menarche age later than girls who are overweight and obese.

Conclusion: The average age of menarche in Birjand is lower than other regions of the country which is the result of different climatic conditions, improving health and social conditions, and improving nutritional status.

Key Words: menarche, puberty

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