Objective To compare the age at menarche obtained by recall method according to the time elapsed since the event, in order to verify the importance of the recall bias. Subjects and methods Were evaluated 1,671 girls (7-18 years) at schools in Campinas-SP regarding the occurrence of menarche by the status quo method (menarche: yes or no) and the recall method (date of menarche, for those who mentioned it). The age at menarche obtained by the status quo method was calculated […]