Fresh embryo transfer group N=1822
Frozen-thawed embryo transfer group N=2098
Frozen-thawed embryo transfer group N=2098
Frozen-thawed embryo transfer group N=2098
χ2/U value
P value
χ2/U value*
P value*
NC-FET group N=1353 HRT-FET group N=745
Total
Neonatal weight 3260(2990,3580)①② 3330(3030,3590) 3350(3060,3625) 3340(3040,3880) 15.07 0.001 -3.73 <0.001
Macrosomia 100(5.5%) 74(5.5%) 59(7.9%) 133(6.34%) 6.42 0.040 1.26 0.261
Large for gestational age 267(14.7%) 238(17.6%) 142(19.1%) 280(18.11%) 9.22 0.010 1.39 0.238
Small for gestational age 95(5.2%) 65(4.8%) 28(3.8%) 93(4.43%) 2.45 0.293 1.30 0.254
Neonatal malformation 49(2.7%) 39(2.9%) 19(2.6%) 58(2.76%) 0.22 0.896 0.02 0.885
Neonatal asphyxia 29(1.6%) 12(0.9%) 14(1.9%) 26(1.24%) 4.30 0.177 0.88 0.349
the rate of neonatal transfer to the NICU 250(13.7%) 174(12.9%) 148(19.9%) 322(15.35%) 20.99 <0.001 2.07 0.150
the reason for neonatal transfer to the NICU
Suspected neonatal infection 72(28.80%) 39(22.41%) 34(22.97%) 73(22.67%)
neonatal jaundice 61(24.4%) 48(27.59%) 29(19.59%) 77(23.91%)
neonatal respiratory distress 31(12.40%) 33(18.97%) 50(33.78%) 83(25.77%)
Preterm birth 49(19.6%) 34(19.54%) 18(12.16%) 52(16.15%)
Neonatal hypoglycemia 11(4.3%) 8(4.60%) 6(4.05%) 14(4.35%)
High-risk infants 9(3.6%) 3(1.72%) 5(3.39%) 8(2.48%)
Scalp hematoma 5(2%) 1(0.57%) 4(2.70%) 5(1.55%)
Vomiting 2(0.8%) 1(0.57%) 1(0.68%) 2(0.62%)
High hemoglobin or anemia 6(2.4%) 3(1.72%) 1(0.68%) 4(1.24%)
Meconium aspiration 1(0.4%) 0(0%) 1(0.68%) 1(0.31%)
Others 2(0.8%) 2(1.15%) 2(1.35%) 4(1.24%)