The Feasibility of Choosing D4 Embryo Transfer—Analysis of Nanomaterials Affecting the Outcome of Frozen-Thaw Embryo Transfer

Table 1

Basic data of patients during the frozen-thaw embryo transfer cycle.

	N (%)	± s
Age	2925	33.08 ± 4.14
≤35	2154 (73.6)	31.20 ± 2.83
>35	771 (26.4)	38.34 ± 2.25
Endometrial thickness (cm)	2925	0.98 ± 0.21
≤0.8	688 (23.5)	0.72 ± 0.078
0.81∼1.0	1247 (42.6)	0.94 ± 0.061
>1.0	990 (33.8)	1.21 ± 0.13
BMI (kg/m2)	2925	23.44 ± 3.70
≤18.5	175 (5.9%)	17.75 ± 0.83
18.6∼23.9	1573 (53.7%)	21.32 ± 1.46
24∼26.9	669 (22.8%)	25.29 ± 0.83
27∼29.9	331 (11.3%)	28.18 ± 0.82
>30	177 (6.0%)	31.99 ± 1.80
Number of embryos transferred
1	726 (24.8)
2	2199 (75.1)
Day of embryo transferred
D3	1234 (42.1)
D4	53 (1.8)
D5	725 (24.7)
D6	913 (31.2)