Table 4 Pregnancy outcomes after euploidy embryo transfer between the two groups

No. of frozen-thawed ET cycles

45

351

Maternal age (years)

28.89 ± 2.78

31.92 ± 3.24

< 0.001

Embryo developmental stage (%)

0.743

 D5

25 (55.6)

204 (58.1)

 D6

20 (44.4)

147 (41.9)

Good-quality embryo transferring (%)

27 (60.0)

284 (80.9)

0.001

Endometrial thickness on ET day (mm)

9.14 ± 1.34

8.64 ± 1.65

0.012

Clinical pregnancy rate (%)

32/45 (71.1)

207/351 (59.0)

0.117

The rate of early pregnancy loss (%)

2/32 (6.3)

22/207 (10.6)

0.443