Evaluation of Age at Menarche and Relevant Factors in Physically Active Iranian Girls

Correct prediction of menarcheal age prepares girls in time for whateverchanges they may experience in the future.very limited data on this subject and related factors from iran is available.materials & methods: this was a cross sectional descriptive study of 629 girls from 24 provinces of iran. data regarding onset of menarcheal age of participants was obtained using questionnaires filled out by each participant assisted by a family member.results: in the 454 cases that were past menarche, mean of age at onset of menarche was 13.1s±0.06 years. it was 12.9±0.25 and 13.6±0.14 years in their grandmothers and mothers, respectively.the regression model showed that the age at menarche was predictable based on the current height of the case (p<0.001), height of theplace of above sea level (p<0.001), number of brothers (p=0.006), and number of sisters (p=0.008) [p=0.001, r-square = 0.99].conclusion: comparing the mean of age at menarcheal onset in grandmothers as the oldest generation to that of mothers and aunts as the middle, and the cases and their sisters as the youngestgeneration in this study showed an evident increase in menarcheal age in the younger generations.