Table 2 Demographic data

Age (years)

30.7 ± 3.6^a,b

27.7 ± 3.6

26.5 ± 2.8

< 0.001^*

BMI (kg/m²)

24.7 ± 3.2^a,b

23.0 ± 2.8

21.6 ± 1.5

< 0.001^*

Fetal weight (g)

3348.8 ± 400.6

3141.8 ± 542.9

-

0.033^*

Biparietal diameter (mm)

92.3 ± 2.8

90.8 ± 4.9

-

0.099

The second stage of labor (mins)

104.4 ± 16.7

85.4 ± 13.3

-

< 0.001^*

Perineal tear (%)

21.2 (11/52)

17.6 (9/51)

-

0.804

Forceps-assisted delivery (%)

25.0 (13/52)

11.8 (6/51)

-

0.126