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Selection bias in in vitro fertilization programs
A Hershlag1, E H Kaplan, R A Loy
1Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut.
American Journal of Obstetrics and Gynecology
|January 1, 1992
Abstract:
Pregnancy rates per cycle reported from different in vitro fertilization-embryo transfer programs vary widely. While several programs have reported constant pregnancy rates per cycle, others report declining pregnancy rates. Selection biases at the point of entry and between cycles are discussed as possible explanations of these discrepancies.