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. Author manuscript; available in PMC: 2014 Mar 3.
Published in final edited form as: Am J Obstet Gynecol. 2013 Jul 17;209(3):254.e1–254.e5. doi: 10.1016/j.ajog.2013.06.019

Table 3. Unadjusted duration of labor, singleton vs twin gestation (h).

Cervical dilation, cm Nulliparas Multiparas


Singleton gestationa Twin gestationa P value Singleton gestationa Twin gestationa P value
3-4 4.8 (10.6) 6.0 (11.9) < .01 5.8 (12.3) 7.7 (14.2) < .01

4-5 3.5 (8.4) 3.8 (8.6) < .01 3.5 (8.1) 4.4 (9.1) < .01

5-6 2.4 (5.9) 2.7 (6.2) < .01 2.2 (5.6) 2.6 (6.0) < .01

6-7 1.7 (4.0) 1.8 (4.1) < .01 1.5 (4.2) 1.6 (4.3) < .01

7-8 1.3 (3.0) 1.5 (3.2) < .01 1.1 (3.0) 1.1 (3.1) b

8-9 1.2 (2.6) 1.3 (2.7) < .01 1.0 (2.6) 1.0 (2.7) b

9-10 1.2 (2.6) 1.3 (2.8) < .01 0.9 (2.3) 0.9 (2.3) b

4-10 8.8 (18.0) 10.7 (20.0) < .01 8.2 (17.4) 9.7 (18.9) < .01

Validity of the model fit is questionable.

a

Data expressed as median (95%);

b

Results shown are based on the last maximum likelihood iteration.