Table 3.

Regression model estimating associated outcomes after matching stratified by age

		Variables	Implantation rate		Clinical Pregnancy rate		Odds of live birth
			Estimate (95% CI)	p-val	Estimate (95% CI)	p-val	OR (95% CI)	p-val
Age <35	N= 858	Embryo transfer day	0.09 (-0.05, 0.23)	0.23	0.05 (-0.09, 0.20)	0.48	0.83 (0.62, 1.09)	0.18
		Propensity score	0.04 (-0.26, 0.35)	0.78	0.13 (-0.19, 0.45)	0.43	0.97 (0.53, 1.74)	0.91
35 ≤Age <37	N= 146	Embryo transfer day	0.17 (-0.23, 0.58)	0.40	0.21 (-0.23, 0.65)	0.35	1.13 (0.55, 2.32)	0.73
		Propensity score	0.57 (-0.17, 1.31)	0.13	0.46 (-0.34, 1.27)	0.26	3.67 (0.99, 13.54)	0.05
37 ≤Age≤38	N= 100	Embryo transfer day	0.35 (-0.17, 0.86)	0.19	0.26 (-0.27, 0.80)	0.33	1.28 (0.52, 3.12)	0.59
		Propensity score	1.11 (0.10, 2.12)	0.03	1.20 (0.16, 2.24)	0.02	4.64 (0.64, 33.43)	0.13
		No. embryos frozen	-0.11 (-0.30, 0.08)	0.24	-0.12 (-0.33, 0.08)	0.23	0.88 (0.64, 1.22)	0.45

Implantation rate: number of gestational sacs/ number of embryos transferred

Clinical Pregnancy rate: number of fetal heartbeats present/ number of embryos transferred