Table 1 Variable distribution after PSM

Female age at embryo transfer

(514) 28.96 ± 3.48

(514) 29.08 ± 3.18

0.55

BMI

(514) 24.15 ± 3.60

(514) 24.15 ± 3.73

0.98

Number of oocytes retrieved

(514) 19.15 ± 8.41

(514) 17.71 ± 7.52

0.01

EM thickness

(514) 10.00 ± 1.62

(514) 10.18 ± 1.55

0.06

Number of transferrable embryos

(514) 9.68 ± 5.63

(514) 8.70 ± 4.68

0.01

Number of top-quality embryos

(514) 1.31 ± 2.92

(514) 1.99 ± 3.20

< 0.01

Triple-line endometrial pattern

0.14

 A

55 (10.7)

74 (14.4)

 B

429 (83.5)

405 (78.8)

 C

30 (5.8)

35 (6.8)

Type of embryo transferred

0.35

 Cleavage stage

157 (30.5)

172 (33.5)

 Blastocyst stage

357 (69.5)

342 (66.5)