Parameter | Full Cohort | P valuec | Singletons Only | P value | ||
---|---|---|---|---|---|---|
IVFa (n = 5144) | ICSIb (n = 2958) | IVF (n = 3697) | ICSI (n = 2263) | |||
Maternal age (years, mean (SD)) | 32.5 ± 3.6 | 32.4 ± 3.7 | 0.169 | 32.7 ± 3.7 | 32.6 ± 3.8 | 0.427 |
Gestational age (wk, mean (SD)) | 37.7 ± 2.2 | 37.8 ± 2.0 | 0.003 | 38.5 ± 1.7 | 38.4 ± 1.6 | 0.925 |
< 32 weeks (No.(%)) | 94(1.8) | 44(1.5) | 0.255 | 33(0.9) | 18(0.8) | 0.693 |
< 37 weeks (No.(%)) | 1050(20.4) | 532(18.0) | 0.008 | 266(7.2) | 153(6.8) | 0.525 |
Birth weight (g, mean (SD)) | 3116.3 ± 614.1 | 3155.8 ± 595.8 | 0.005 | 3346.2 ± 497.4 | 3345.8 ± 499.0 | 0.978 |
< 1500 g (No.(%)) | 87(1.7) | 40(1.4) | 0.235 | 24(0.6) | 15(0.7) | 0.949 |
< 2500 g (No.(%)) | 749(14.6) | 372(12.6) | 0.012 | 166(4.5) | 97(4.3) | 0.710 |
≥4000 g (No.(%)) | 275(5.3) | 170(5.7) | 0.450 | 275(7.4) | 170(7.5) | 0.916 |
Obstetrical events (No.(%)) | ||||||
 Cesarean section | 3936(76.5) | 2247(76.0) | 0.609 | 2543(68.8) | 1575(69.6) | 0.655 |
 Placenta previa | 361(7.0) | 197(6.7) | 0.540 | 231(6.2) | 137(6.1) | 0.762 |
 Hypertensive disorders | 636(12.4) | 381(12.9) | 0.499 | 340(9.2) | 238(10.5) | 0.095 |
 Gestational Diabetes | 1136(22.1) | 670(22.7) | 0.555 | 805(21.8) | 498(22.0) | 0.834 |