Combined analysis of estradiol and β-hCG to predict the early pregnancy outcome of FET: a retrospective study

Table 2 Cycle parameters and serum E₂ and β-hCG levels on day 12 following FET with NCs

Cycle parameters	Group (n = 1521)
	CE Group (n = 595)				B Group (n = 926)
	CE-CP Group (n = 501)	CE-BP Group (n = 94)	t/χ2 ^a	P^a	B-CP Group (n = 759)	B-BP Group (n = 167)	t/χ2 ^b	P^b
No. of embryos transferred	1.91 ± 0.52	1.89 ± 0.50	-0.249	0.803	1.53 ± 0.50	1.46 ± 0.50	-1.730	0.084
No. of high-quality embryos transferred	1.60 ± 0.69	1.53 ± 0.74	-0.854	0.393	1.00 ± 0.68	0.89 ± 0.66	-1.922	0.055
Endometrial thickness (mm)	10.17 ± 1.71	10.04 ± 1.74	-0.683	0.495	10.25 ± 1.68	10.40 ± 1.81	1.048	0.295
Day 12 E₂ levels (pg/mL)	212.04 ± 151.27	112.18 ± 43.18	-12.34	<0.001	215.06 ± 96.80	135.87 ± 55.20	-14.317	<0.001
Day 12 β-hCG levels (mIU/mL)	474.73 ± 351.88	69.18 ± 43.41	-24.81	<0.001	832.88 ± 694.36	107.49 ± 88.44	-27.78	<0.001

CE-CP: cleavage embryo-clinical pregnancy; CE-BP: cleavage embryo-biochemical pregnancy; B-CP: blastocyst-clinical pregnancy; B-BP: blastocyst-biochemical pregnancy; P ^a and t/χ2 ^a value for comparison between CE-CP Group and CE-BP Group; P ^b and t/χ2 ^b value for comparison between B-CP Group and B-BP Group

ISSN: 1757-2215