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

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 (5th percentile, 95th 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.
Graphic 132751 Version 1.0

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