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BACKGROUND: The aim of this retrospective cohort study was to evaluate the effect of day 3 embryo cell number on the clinical pregnancy and neonatal outcomes of single blastocyst transfer in frozen embryo transfer (FET) cycles. METHODS: The study included 1220 single blastocyst transfer from FET cycles conducted between January 2017 and April 2024. Patients were categorized into four groups based on day 3 embryo cell number : 110 cycles in the 13-cell group. The study compared the clinical pregnancy outcomes and neonatal outcomes among the four groups. RESULTS: When the maternal age was 13-cell group were significantly higher than those of the 9 was comparable to that of 7-9 cells.
Tao et al. (Wed,) studied this question.
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