The impact of serum estradiol and progesterone levels during implantation on obstetrical complications and perinatal outcomes in frozen embryo transfer.

Logistic regression analysis demonstrated that the risk of placenta previa, placenta accreta, and PIH was potentially higher in HT-FET pregnancies than in NC-FET pregnancies, although the differences did not reach statistical significance (Table 4 ).

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The univariate odds ratios (uORs) and mORs for these outcomes showed a trend towards increased risk in the programmed FET group, but the CIs were wide.

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