Obstetric factors

Low (<85)

(n = 38)

High (85 or more)

(n = 9)

P-value*

Time duration (hour)

Whole labor

9.2 (6.3)

12.9 (3.0)

0.015*

Stage 1-1

4.1 (3.5)

8.2 (3.3)

0.003*