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Table 2 Reproductive outcomes following transferring blastocyst stage embryo

From: Effects of pre-pregnancy body mass index on pregnancy and perinatal outcomes in women with PCOS undergoing frozen embryo transfer

CharacteristicsNormal(N = 972)Overweight(N = 480)Obesity(N = 228)Normal vs. OverweightOverweight vs. ObestiyNormal vs. Obesity
Number of FET972480228   
Number of thawed embryos1839908423   
Number of transferred embryos1828905418   
Embryo quality,%(n)   0.3290.5930.443
 High-quality embryos1789 (97.26%)877 (96.92%)405 (96.81%)   
 Low-quality embryos50 (2.74%)28 (3.08%)13 (3.19%)   
Clinical pregnancy rate per transfer,%(n)59.26%(576/972)57.71%(277/480)55.26%(126/228)0.4050.4010.307
Implantation rate,%(n)41.08%(751/1828)40.77%(369/905)38.52%(161/418)0.4760.3250.282
Miscarriage rate,%(n)11.28%(65/576)16.61%(46/277)15.08%(19/126)0.0690.4320.184
Multiple pregnancy rate,%(n)30.38%(175/576)33.21%(92/277)27.78%(35/126)0.2980.2490.377
Ectopic pregnancy rate,%(n)1.56%(9/576)2.46%(7/284)1.56%(2/128)0.2580.4380.623
Intrauterine and ectopic pregnancy rate,%(n)0%(0/585)0.35%(1/284)0%(0/128)0.5480.5270.328
Ongoing pregnancy rate,%(n)54.94%(534/972)53.13%(255/480)52.19%(119/228)0.3790.4770.366
Live birth rate,%(n)50.21%(488/972)45.83%(220/480)46.49%(106/228)0.1910.5170.251