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
No. of viable embryos after thawed (n)	1604	1680
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			0.691
Vaginal	119	124
Cesarean	283	304
Newborn, n			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