Obstetric factors

Low (<85)

(n = 18)

High (85 or more)

(n = 8)

P-value*

Time duration (hour)

Whole labor

12.8 (6.9)

13.1 (3.2)

0.879

Stage 1-1

4.8 (3.8)

8.6 (3.3)

0.024*

Stage 1-2

6.8 (6.0)

3.8 (0.8)

0.052

Stage 2

1.1 (1.3)

0.6 (0.3)

0.203

Labor pain intensity (NRS score)

At the time of 4 - 6 cm of cervical dilatation

6.6 (2.4)

8.8 (3.4)

0.071

At full cervical dilation

13.8 (4.6)

15.4 (5.5)

0.448

Immediate after delivery

3.2 (3.1)

3.4 (2.7)

0.906

Accumulated labor pain intensity

Whole labor

Stage 1-1

93.9 (72.0)

16.7 (18.0)

88.7 (24.2)

33.5 (9.8)

0.846

0.021*

Stage 1-2

60.0 (56.2)

46.3 (20.4)

0.514

Stage 2

17.2 (25.9)

8.8 (3.3)

0.195