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The Effectiveness of Postcoital Hormonal Contraception. (RESEARCH NOTES).

Readings on Emergency Contraception

| January 01, 1996 | Trussell, James; Stewart, Felicia | COPYRIGHT 1996 Guttmacher Institute. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

In a recent review of the literature on the efficacy of postcoital hormonal contraception (PCHC), Louise Silvestre, Yasmina Bouali and Andre Ulmann reanalyzed the data from all previous studies of PCHC that had a sample of at least 500 women. (1) Five of these 10 studies involved treatment with high doses of estrogen; the other five involved a newer treatment with combined estrogen-progestin (CEP) preparations (see Table 1). (2)

First, Silvestre and her colleagues stated that the failure rates reported in all 10 studies were misleading because they were computed as the number of observed pregnancies divided by the total number of women who were treated with PCHC. ...

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