Table 3 Neonatal outcomes of FETs between immediate and delayed groups stratified by COS protocol
GnRHa protocol | GnRHant protocol | |||||
|---|---|---|---|---|---|---|
Immediate FET (n = 1585) | Delayed FET (n = 1525) | P value | Immediate FET (n = 778) | Delayed FET (n = 516) | P value | |
Preterm birth (<37 weeks) | 24.4 (189/774) | 26.4 (197/745) | 0.365 | 23.1 (92/399) | 19.4 (51/263) | 0.262 |
Still birth | 0.4 (3/774) | 0.1 (1/745) | 0.625 | 0.3 (1/399) | 0 (0/263) | 1.000 |
Gestational age (weeks) | 37.41 ± 2.44 | 37.46 ± 2.29 | 0.731 | 37.45 ± 2.45 | 37.57 ± 2.27 | 0.515 |
Birth height (mm) | 49.04 ± 2.68 | 48.91 ± 2.36 | 0.356 | 48.37 ± 3.27 | 48.58 ± 2.84 | 0.179 |
Birth weight (kg) | 3.00 ± 0.62 | 2.99 ± 1.15 | 0.891 | 2.93 ± 0.64 | 2.91 ± 0.60 | 0.548 |
Low birth weight (<2500 g) | 22.8 (225/988) | 25.1 (247/983) | 0.221 | 21.4 (106/496) | 19.7 (66/335) | 0.560 |
Very low birth weight (<1500 g) | 1.6 (16/988) | 1.8 (18/983) | 0.718 | 2.2 (11/496) | 2.4 (8/335) | 0.872 |
Congenital anomalies | 1.0 (10/988) | 0.3 (3/983) | 0.053 | 2.2 (11/496) | 1.2 (4/335) | 0.277 |
Sex ratio (male/female) | 1.17 (532/456) | 1.17 (529/454) | 0.989 | 1.28 (278/218) | 1.31 (190/145) | 0.849 |