Table 1.

Baseline groups characteristics

	eSBT (n = 148)	DBT (n = 162)	p value
Women age (years)	40.73 ± 0.84	41.15 ± 0.93	0.11
BMI (kg/m2)	24.5 ± 5	25 ± 5	0.38
AFC	14 ± 9.5	14.2 ± 9.8	0.85
Baseline FSH	7.7 ± 2.6	7.5 ± 3.6	0.57
Number of previous IVF cycles	0.5 ± 0.8	1.1 ± 1	<0.01
Primary infertility	63%	61%	0.47
Infertility diagnosis n (%)			0.64
Unexplained	60 (41)	58 (36)
Male factor	36 (24)	50 (31)
PCOS	16 (11)	14 (8.6)
Mechanical factor	10 (6.7)	13 (8)
Endometriosis	5 (3.3)	3 (1.8)
Diminished ovarian reserve	8 (5)	6 (4)
Combined factors	13 (9)	18 (10.6)

eSBT elective blastocyst transfer, DBT double blastocyst transfer, BMI body mass index, AFC antral follicle count, PCOS polycystic ovary syndrome

p < 0.05 was considered statistically significant