Article ID Journal Published Year Pages File Type
3915412 Contraception 2007 5 Pages PDF
Abstract
We found generally good concordance between the starts of menstrual periods as determined by an algorithm adapted from the WHO and the date of the start of a period as reported by participants on diary cards. In our earlier study, we found that the earlier in the cycle a woman took 1.5 mg levonorgestrel, the earlier was the next period. Had we relied on women's recording of the first period on the diary card, we would not have reached that conclusion.
Related Topics
Health Sciences Medicine and Dentistry Obstetrics, Gynecology and Women's Health
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