[Retracted] Analysis of Relevant Factors Affecting the Pregnancy Rate of Frozen-Thawed Embryo Transfer Cycle

Table 1

Univariate analysis of factors influencing FET biochemical pregnancy [n (%)].

	n	Pregnancy (n = 450)	Nonpregnancy (n = 481)	x^2
Cause of infertility				1.084	0.582
Female-side cause	745	361	384
Male-side cause	160	79	81
Other causes	26	10	16
Age (year)				27.205	＜0.01
＜30	544	253	291
≥30	387	114	273
Infertility years (years)				5.256	0.022
≤3	678	258	420
＞3	253	117	136
Ovulation induction medication				1.945	0.163
CnRH-a	891	435	456
CnRH-ant	40	15	25
Fertilization method				3.777	0.052
IVF	757	377	380
ICSI	174	73	101
Endometrial thickness(mm)				7.412	0.025
＜8	224	95	129
8–10	653	334	319
＞10	54	21	33
E2 (pg/ml)				5.378	0.068
＜200	422	221	201
200–700	395	175	220
＞700	114	54	60
(pg/ml)				7.110	0.029
＜0.3	345	148	197
0.3–0.7	439	223	216
＞0.7	147	79	68
E2/				13.143	0.001
＜0.3	174	87	87
0.3–0.7	310	173	137
≥0.7	447	190	257
Number of high-quality embryos (n)				63.184	＜0.001
1	803	308	495
≥2	128	97	31

GnRH-a: gonadotropin-releasing hormone receptor agonist; GnRH-ant: gonadotropin-releasing hormone receptor antagonist; E2: estradiol; and P: progesterone.