Stage 1-2

4.4 (4.8)

4.0 (1.1)

0.729

Stage 2

0.6 (1.0)

0.6 (0.3)

0.894

Labor pain intensity (NRS score)

At the time of 4 - 6 cm of cervical dilatation

5.9 (2.4)

8.6 (3.2)

0.007*

At full cervical dilatation

12.1 (4.1)

15.2 (5.1)

0.058

Immediate after delivery

2.9 (2.8)

4.1 (3.4)

0.271

Accumulated labor pain intensity

Whole labor

Stage 1-1

59.6 (60.5)

13.4 (14.8)

87.2 (23.1)

31.7 (10.6)

0.188

0.001*

Stage 1-2

36.7 (45.2)

47.4 (19.3)

0.494

Stage 2

9.5 (19.1)

8.1 (3.8)

0.830