Table 1 Patient characteristics according to sperm DFI

Female age (years)

30.9 ± 5.4^a

30.8 ± 5.3^b

32.0 ± 5.7^a,b

<  0.001

Female BMI (kg/m²)

22.7 ± 3.1^a

22.4 ± 3.1^a

22.7 ± 3.1

0.033

Primary

408 (59.0)^a,c

623 (65.4)^a

260 (61.6)

0.027

Secondary

284 (41.0)

330 (34.6)

162 (38.4)

–

Duration of infertility (years)

4.2 ± 3.3

4.1 ± 3.3

4.6 ± 3.6

0.054

Thickness of endometrium (mm)

10.6 ± 2.9^a

11.1 ± 3.0^a

10.8 ± 3.0

0.002

Male age (years)

32.3 ± 5.8^a

32.7 ± 6.3^d

34.1 ± 7.4^a,d

0.001

Male BMI (kg/m²)

24.9 ± 3.9

24.8 ± 4.0

24.5 ± 3.9

0.194

DFI (%)

9.8 ± 3.3^b

22.2 ± 4.3^b

39.8 ± 9.9^b

<  0.001