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- W1993304085 abstract "Trussell at al. [1] analyzed the impact of suppressing ovulation on the effectiveness of the Yuzpe method of emergency contraception (EC). They used a model developed earlier for the overall estimation of the effectiveness of emergency contraception to analyze the differences in the effectiveness by cycle-day of intercourse [2,3]. The estimations are based on a comparison of the number of observed versus expected pregnancies for timed intercourse in relation to ovulation as predicted by calculation from last menstruation. Because of substantial discrepancies between predicted risk according to hormonal data and the calendar prediction of risk, the validity of this approach has been questioned previously [4–7]. However, exactly how the hormonal data predict the real risk has not been studied. We argue that whereas the Trussell’s et al. [2,3] calculation method can be reasonably used for the estimation of the overall effectiveness of EC, its extension to compare effectiveness for different intervals in the cycle is methodologically flawed." @default.
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- W1993304085 date "2003-07-01" @default.
- W1993304085 modified "2023-09-26" @default.
- W1993304085 title "Uncertainty in estimating the day of ovulation causes overestimation of the role of ovulation disturbance on the effectiveness of the Yuzpe method of emergency contraception" @default.
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- W1993304085 doi "https://doi.org/10.1016/s0010-7824(03)00100-8" @default.
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