17Β-Estradiol (E2), basal body temperature (BBT) and luteinizing hormone (LH), were measured in normally menstruating women. The preovulatory E2 observations were characterized by variations about a constant level followed by a nearly linear rise to a peak. The BBT observations typically varied about a constant level during the preovulatory phase then about a higher constant level during the postovulatory phase. The change points in E2 and BBT were detected using a Bayesian detection rule and a midcycle ‘fertile period’ was marked off. The midcycle ‘fertile periods’ appear to bracket the ovulation event and the method shows promise as a natural family planning method. Several practical limitations of the method are discussed.

Keywords:
Ovulation, Prediction, Detection, Estrogen, BBT, Bayesian detection rule
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© 1982 S. Karger AG, Basel
1982
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