Effects of Various Transfer Strategies of Frozen-Thawed Cleavage-Stage and Blastocyst Embryos on Pregnancy and Neonatal Outcomes in Different Age Groups.

Although there was no statistical difference, the preterm birth rate also had a significant trend to increase.

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It should be noted that these differences are due to the difference in the sample sizes of each group, and therefore may not reflect practically significant or clinically meaningful differences in a real-world setting.

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