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JOURNAL ARTICLE

The risk of post-pill amenorrhea: a preliminary report from the Menstruation and Reproduction History Research Program

G S Berger, R N Taylor, A E Treloar
International Journal of Gynaecology and Obstetrics 1977, 15 (2): 125-7
606581
Menstrual cycle lengths prior to and after oral contraceptive use were prospectively recorded for 245 women. In this preliminary study, a difference in the distributions in the pre- and post-pill cycle lengths was observed. An increase of 5 days in the medial cycle length occurred after oral contraceptive use had been discontinued. Although there was an approximately twofold relative risk of amenorrhea of 90 days' duration or more after discontinuing pill use, the differences in the rates of amenorrhea between the pre-pill and post-pill cycles were not statistically significant.

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