Table 1.

Patient demographics and cycle characteristics (N = 568)

Age at study entry (years)	31.8 ± 5.7
Age at freezing (years)	30.8 ± 5.6
Infertility duration (years)	2.9 ± 2.4
BMI	25.5 ± 5.4
Gravidity	1.1 ± 1.2
Parity	0.5 ± 0.7
Endometrial thickness (mm)	8.9 ± 1.7
At least one good quality embryo transferred	330 (64.3)
Number of embryos transferred	1.9 ± 0.7 [2; 1–4]

Continuous data is mean ± sd; binary data is N (%)