Abstract Background: Considering different effective factors in age of menarche in different
geographical areas and the necessity of determining a reliable and upto-date reference in
this field, the aim of this study was to determine the mean age of menarche in 11-18 years
old school-girls of Shahrekord. Methods: This was a descriptive cross-sectional study among
778 school girls aged 11-18 years of Shahrekord which were selected by clustering method
among 8163 students. Data was collected using a questionnaire about demographic ..