Menstrual histories were obtained from 51 females with Down syndrome between the ages of 10ndash;27 years. The average age at onset of menstruation of girls in our study was 12 years, 6 months. Seventy-six percent of them had regular menstrual cycles with an average length of menstrual flow of 4 days, and most menstrual cycles lasted 25ndash;30 days. Eight of the women with regular menstrual cycles provided 26 basal body temperature charts. When basal body temperatures were graphed using the smoothed-curve technique, 88.5percnt; had biphasic curves indicative of an ovulatory pattern.
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