Intramuscular injection of human chorionic gonadotropin prior to secretory transformation in patients undergoing frozen-thawed embryo transfer cycles

Table 3 Subgroup analysis

	Control group	hCG group	Odds ratio (95% CI)	P-value
Blastocyst	n = 83	n = 81
Implantation rate*	45/134(33.6%)	68/130(52.3)	2.169(1.320–3.566)	0.002
Clinical pregnancy rate^*	37/83 (44.6%)	54/81 (66.7%)	2.486 (1.320–4.683)	0.004
Ongoing pregnancy rate^#	28/83 (33.7%)	41/81 (50.6%)	2.013 (1.072–3.780)	0.029
Live birth delivery rate	26/83 (31.3%)	37/81 (45.7%)	1.844 (0.975–3.487)	0.059
Cleavage-stage embryo	n = 272	n = 252
Implantation rate*	196/534(36.7%)	222/492(45.1%)	1.418(1.104–1.821)	0.006
Clinical pregnancy rate	144/272 (52.9%)	151/252 (59.9%)	1.329 (0.940–1.880)	0.108
Ongoing pregnancy rate	126/272 (46.3%)	135/252 (53.6%)	1.337 (0.948–1.885)	0.097
Live birth delivery rate^#	115/272 (42.3%)	129/252 (51.2%)	1.432 (1.014–2.021)	0.041

^*P < 0.01
^#P < 0.05
Note: There were 9 cycles and 4 cycles transferred both cleavage stage embryo and blastocyst in control group and hCG group, respectively, which were not included in subgroup analysis

ISSN: 1477-7827