Time in hours for each centimeter of cervical dilation in nulliparous patients

Cervical dilation (cm)	Induction of labor (n=732)	p*	Augmented labor (n=688)	p*	Spontaneous labor (n=572)
4 to 10	5.5 (1.8, 16.8)	<0.01	5.4 (1.8, 16.8)	<0.01	3.8 (1.2, 11.8)
3 to 4	1.4 (0.2, 8.1)	<0.01	1.2 (0.2, 6.8)	<0.01	0.4 (0.1, 2.3)
4 to 5	1.3 (0.2, 6.8)	<0.01	1.4 (0.3, 7.6)	<0.01	0.5 (0.1, 2.7)
5 to 6	0.6 (0.1, 4.3)	0.02	0.7 (0.1, 4.9)	<0.01	0.4 (0.06, 2.7)
6 to 7	0.4 (0.05, 2.8)	0.05	0.5 (0.06, 3.9)	<0.01	0.3 (0.03, 2.1)
7 to 8	0.2 (0.03, 1.5)	0.93	0.3 (0.05, 2.2)	0.01	0.3 (0.04, 1.7)
8 to 9	0.2 (0.03, 1.3)	0.80	0.3 (0.05, 2.0)	<0.01	0.2 (0.03, 1.3)
9 to 10	0.3 (0.04, 1.9)	0.13	0.3 (0.05, 2.4)	<0.01	0.3 (0.04, 1.8)

Data presented in hours as median (5^th percentile, 95^th percentile) unless otherwise specified. The reference group was spontaneous labor.

* Adjusted for race, body mass index greater than 30 kg/m², birth weight greater than 4000 g, and Bishop score higher than 5 at admission.

From: Harper LM, Caughey AB, Odibo AO, et al. Normal progress of induced labor. Obstet Gynecol 2012; 119:1113. DOI: 10.1097/AOG.0b013e318253d7aa. Copyright © 2012 American College of Obstetricians and Gynecologists. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.

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Time in hours for each centimeter of cervical dilation in nulliparous patients