Table 3.

Multivariable linear regression analysis for unadjusted birth weight, gestational age, and adjusted birth weight.

	Unadjusted birth weight(g)			Gestational age(weeks)			Adjusted birth weight(g)
	β	Std. Error	P value	β	Std. Error	P value	β	Std. Error	P value
Blastocyst vs. Cleavage embryo	30.28	13.17	0.022	-0.03	0.05	0.599	0.09	0.03	0.007
Double vs. single embryo	13.93	12.25	0.255	0.11	0.05	0.019	0.05	0.03	0.099
Maternal age	-0.53	1.51	0.727	-0.01	0.01	0.013	0.00	0.00	0.596
Paternal age	0.49	1.16	0.674	-0.01	0.00	0.168	0.00	0.00	0.906
Maternal BMI	10.34	0.97	<0.001	-0.02	0.00	<0.001	0.03	0.00	<0.001
Type of infertility
Second vs. Primary infertility	44.33	8.87	<0.001	0.00	0.03	0.904	0.09	0.02	<0.001
Parity
Pluriparous vs. Nulliparous	26.06	16.38	0.112	-0.18	0.06	0.005	0.07	0.04	0.090
Duration of infertility	3.21	2.90	0.269	-0.01	0.01	0.205	0.01	0.01	0.294
Infertility causes
Female factor(reference)
Male factor	-11.94	13.52	0.377	0.08	0.05	0.125	-0.03	0.03	0.394
Combined factor	-16.64	10.50	0.113	0.06	0.04	0.145	-0.04	0.03	0.152
Unexplained	-19.92	14.80	0.178	0.15	0.06	0.012	-0.05	0.04	0.156
Fertilization type
IVF-only (reference)
ICSI-only	15.00	12.68	0.237	0.00	0.05	0.987	0.04	0.03	0.183
IVF/ICSI split	5.48	20.79	0.792	-0.07	0.08	0.388	0.00	0.05	0.986
Sperm origin
TESE vs. Ejaculation	-25.05	28.52	0.380	0.15	0.11	0.181	-0.06	0.07	0.453
Endometrial preparation program  Natural cycle (reference)
Mild Stimulation cycle	-12.45	10.01	0.214	-0.16	0.04	<0.001	-0.04	0.03	0.092
Hormonal replacement cycle	14.99	10.48	0.153	-0.19	0.04	<0.001	0.05	0.03	0.069
Neonatal gender
Female vs. male	-137.93	8.07	<0.001	0.14	0.03	<0.001	-0.07	0.02	0.001
Gestational age	179.04	2.53	<0.001	—	—	—	0.10	0.01	<0.001