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. 1992 Jan;166(1 Pt 1):1-3.
doi: 10.1016/0002-9378(92)91815-r.

Selection bias in in vitro fertilization programs

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Free article

Selection bias in in vitro fertilization programs

A Hershlag et al. Am J Obstet Gynecol. 1992 Jan.
Free article

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.

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