Table 1 Embryo quality and clinical outcomes

Female age (years)

37.8 ± 0.3

38.3 ± 0.2

38.0 ± 0.3

38.4 ± 0.6

0.05

Not applicable

N/A

Male age (years)

39.7 ± 0.5

40.1 ± 0.3

40.1 ± 0.5

40.8 ± 1.0

0.45

N/A

BMI (kg/m2)

23.0 ± 0.5

23.5 ± 0.3

23.7 ± 0.5

23.5 ± 1.5

0.24

N/A

Infertility duration (years)

0.8 ± 0.1

0.8 ± 0.1

0.9 ± 0.2

1.0 ± 0.4

0.87

N/A

Previous miscarriages

0.77 ± 0.1

0.81 ± 0.09

0.85 ± 0.2

0.93 ± 0.4

0.82

N/A

Oocytes

14.4 ± 0.8^a

12.5 ± 0.4

11.5 ± 0.7^a

12.2 ± 1.3

< 0.001

^ap = 0.02

Mature oocytes

12.8 ± 0.6^ab

11.5 ± 0.4

10.7 ± 0.5^a

10.2 ± 1.0^a

< 0.001

^ap = 0.031

^bp = 0.027

Endometrial thickness (mm)

8.9 ± 0.2^a

8.2 ± 0.5^b

7.1 ± 0.1^ab

7.5 ± 0.4

0.04

^ap = 0.049

^bp = 0.038

Implantation rate (%)

64.0%^a,b

62.2%^c

50.2%^b,c

49.4%^a,c

< 0.001

^ap < 0.001

^bp < 0.001

^cp < 0.001

Pregnancy rate (%)

64.0%^a.b

62.2%^c

50.2%^b,c

49.4%^a,c

< 0.001

^ap < 0.001

^bp < 0.001

^cp < 0.001

Miscarriage rate (%)

11.3%

12.8%

11.8%

12.5%

0.833

N/A

Live birth rate (%)

50.2%^a,b

47.5%^c

37.0%^b,c

34.4%^a,c

< 0.001

^ap < 0.001

^bp < 0.001

^cp < 0.001