Table 1 Demographics of the study population

Maternal age, years

31.2 ± 4.6

31 [27.7; 34.3]

30.7 ± 4.5

30.4 [27.5; 33.8]

0.225^‡

Maternal BMI

24.5 ± 4.3

23.8 [21.4; 26.8]

24.3 ± 4.1

23.5 [21.4; 26.4]

0.912^‡

Gestational age, days

281 ± 9.1

281 [275; 287]

280 ± 9.9

281 [275; 287]

0.475^‡

Fetal weight, grams

3636 ± 459

3613 [3346; 3920]

3614 ± 442

3612[3319; 3907]

0.938^‡

Cord artery pH

7.23 ± 0.08

7.23 [7.18; 7.28]

7.23 ± 0.08

7.23 [7.17; 7.28]

0.455^‡

n (%)

n (%)

Parity

Primipara

Multipara

576 (61.3)

363 (38.7)

583 (63.5)

335 (36.5)

0.338*

Previous perineal tear (yes)

269 (32.3)

255 (31.0)

0.598*

Epidural anesthesia (yes)

263 (28.3)

245(26.7)

0.435*

Intrapartum antibiotic

None

Narrow spectrum

Broad spectrum

674 (73.1)

188 (20.4)

60 (6.5)

670 (74.1)

176 (19.5)

58 (6.4)

0.873*

Delivery mode

Partus normalis

Instrumental vaginal delivery

853 (91.3)

81 (8.7)

831 (90.5)

87 (9.5)

0.572*

Tobacco during pregnancy (yes)

28 (3.1)

31 (3.4)

0.693*

Diabetes (yes)

4 (0.4)

5 (0.5)

0.751*

Genital herpes (yes)

10 (1.1)

12 (1.3)

0.673*

Connective tissue disease (yes)

10 (1.1)

10 (1.1)

1.000*

Education

Primary

Secondary

Tertiary

51 (5.8)

290 (32.8)

543 (61.4)

42 (4.8)

258 (29.6)

573 (65.6)

0.176*