Table 1 Characteristics of patients before and after PS matching

Male age

32.5 ± 4.4

33.2 ± 4.9

− 0.154

32.4 ± 4.4

32.2 ± 4.5

0.034

Female age

30.5 ± 4.5

30.9 ± 4.1

− 0.084

30.4 ± 4.5

30.5 ± 4.1

− 0.01

No. of previous transfer

1.43 ± 1.28

1.76 ± 1.02

− 0.257

1.44 ± 1.30

1.51 ± 0.82

− 0.056

infertility duration (year)

2.9 ± 2.8

4.4 ± 2.8

− 0.534

3.0 ± 2.8

3.0 ± 2.3

−0.02

No. of previous gestation

1.55 ± 1.28

0.83 ± 1.06

0.411

1.44 ± 1.57

1.62 ± 1.40

−0.103

AMH (ng/mL)

5.35 ± 3.97

6.48 ± 4.47

− 0.284

5.41 ± 3.99

5.34 ± 3.78

0.018

BMI (kg/m²)

22.39 ± 3.09

22.15 ± 4.16

0.079

22.35 ± 3.10

22.65 ± 8.28

−0.097

EMT^a (mm)

8.7 ± 1.5

8.9 ± 1.6

− 0.114

8.7 ± 1.5

8.7 ± 1.5

0.024

Days of embryo transferred

5.30 ± 0.46

5.16 ± 0.37

0.303

5.28 ± 0.45

5.32 ± 0.47

−0.071

Day of embryo vitrified

5.30 ± 0.46

5.16 ± 0.37

0.303

5.28 ± 0.45

5.32 ± 0.47

−0.071

Day of embryo transferred %(n)

1.7E-5

 5

70.2 (99)

84.1 (2048)

71.7 (99)

70.4 (188)

0.781 ^b

 6

29.8 (42))

15.9 (387)

28.3 (39)

29.6 (79)

Embryo morphology %(n)

0.940^b

 Good

89.4 (126)

89.2 (2171)

89.1 (123)

90.6 (242)

0.630^b

 Fair

10.6 (15)

10.8 (264)

10.9 (15)

9.4 (25)

PGT indications % (n)

NA^c

NA^c

 Monogenetic diseases

45.4 (64)

45.7 (63)

 Chromosomal diseases

31.9 (45)

32.6 (45)

 Recurrent mscarriage

19.9 (28)

18.8 (26)

 Recurrent implantation failure

2.8 (4)

2.9 (4)