It is interesting that when put to the test of randomization, there is no difference in the preterm delivery in both groups.
Previous large datasets except Kato et al. ( 2012) have suggested increase in preterm and very preterm delivery for even singletons born as a result of fresh embryo transfer as compared to those born after frozen embryo transfer. Mechanisms thought to be hyper-estrogenized endometrium and abnormal placentation leading to increased preterm delivery in babies born after fresh embryo transfer.
Any suggestions why results could be different in this study?
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