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Department of Chemical Pathology, Obafemi Awolowo University, Nigeria.
Questionnaires and interviews with 768 female students in residence at the Obafemi Awolowo University, Ile-Ife, Nigeria revealed that the mean and median ages of menarche were respectively 13.4 +/- 1.4 and 13.5 years and 80.8% had menstrual cycles between 25 and 35 days. The duration of menstrual bleeding was 4.5 +/- 0.8 days; 72.3% had dysmenorrhea and 17.8% complained of nausea and vomiting during menstruation.
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