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目的探讨体外受精-胚胎移植(in vitro fertilization and embryo transfer,IVF—ET)的COH周期中HCG注射日卵泡径线与妊娠率的相关性。方法选取480个IVF/ICSI—ET周期并根据HCG日最大卵泡径线分为:A(15~16.5mm),B(17mm),C(17~18mm),D(18.5~19.5mm)和E(≥20mm)共5组来分析HCG日的卵泡径线、获卵数、子宫内膜厚度与妊娠结局的关系。结果5组妊娠率分别为61.0%,54.5%,48.3%,40.3%,35.5