Abstract
Objective: Non-randomized studies report higher pregnancy rates for tubal transfer of embryos (zygote intrafallopian transfer ZIFT) than for intrauterine embryo transfer (ET). Similarly, the SART database consistently reports higher pregnancy rates for ZIFT. Prospective randomized studies included small numbers and suffered from lack of statistical power. Therefore, we analyzed published randomized trials of outcomes of ZIFT and ET for in vitro fertilization cycles via meta-analysis.
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