Table 1.

Characteristics of women included in this study.

	≤3 mm	3-15 mm	≥15 mm	P
Age (year)
Day 3	32.52 ± 5.50	32.86 ± 5.16	34.00 ± 5.45	0.656
Day 5	30.48 ± 4.54	30.69 ± 4.02	30.90 ± 4.67	0.841
Embryos transferred, n
Day 3	1.86 ± 0.36	1.85 ± 0.36	1.75 ± 0.48	0.556
Day 5	1.04 ± 0.19	1.13 ± 0.34	1.15 ± 0.36	0.106
Endometrial thickness (mm)
Day 3	0.48 ± 0.10	0.51 ± 0.09	0.53 ± 0.09	0.168
Day 5	0.48 ± 0.06	0.50 ± 0.08	0.53 ± 0.11	0.161

DAF, distance from the air bubble to endometrial cavity fundus.