Table 2 Pregnancy and newborn outcomes in two groups in FET cycle
|  | LH surge (n = 920) | Without LH surge (n = 977) | P |
|---|---|---|---|
No. of thawed embryos (n) | 1624 | 1705 | Â |
No. of viable embryos after thawed (n) | 1604 | 1680 | Â |
Implantation, % (n) | 36.2% (580) | 36.7% (618) | 0.772 |
Biochemical pregnancy, % (n) | 54.8% (504) | 55.4% (541) | 0.796 |
Clinical pregnancy, % (n) | 50.9% (468) | 51.7% (505) | 0.721 |
Multiple pregnancy, % (n) | 0 | 0.4% (2) | 0.5 |
Miscarriage, % (n) | 11.5% (54) | 11.5% (58) | 0.979 |
Heterotopic pregnancy, % (n) | 14.9% (7) | 21.8% (11) | 0.482 |
Live birth, % (n) | 43.7% (402) | 43.8% (428) | 0.961 |
Gestation age (weeks) | 38.06 ± 1.83 | 38.14 ± 1.61 | 0.506 |
Modes of delivery, n | Â | Â | 0.691 |
 Vaginal | 119 | 124 |  |
 Cesarean | 283 | 304 |  |
Newborn, n | Â | Â | 0.804 |
 Single birth | 304 | 321 |  |
 Twin birth | 98 | 107 |  |
Birth weight, mean ± SD |  |  |  |
 Singletons | 3366.32 ± 450.92 | 3334.33 ± 453.45 | 0.794 |
  < 2500 g, n | 8 | 11 |  |
  ≥ 4000 g, n | 21 | 25 |  |
 Twins | 2609.04 ± 425.60 | 2616.61 ± 362.16 | 0.165 |
  < 2500 g, n | 64 | 74 |  |
  < 1500 g, n | 2 | 0 |  |