Table 4. Adjusted duration of labor, singleton vs twin gestation (h)a.
| Cervical dilation, cm | Nulliparas | Multiparas | ||||
|---|---|---|---|---|---|---|
|
|
|
|||||
| Singleton gestationb | Twin gestationb | P value | Singleton gestationb | Twin gestationb | P value | |
| 3-4 | 5.2 (11.2) | 6.4 (12.3) | < .01 | 7.6 (14.4) | 9.5 (16.2) | < .01 |
|
| ||||||
| 4-5 | 3.8 (8.9) | 4.4 (9.5) | < .01 | 4.2 (9.2) | 5.6 (10.6) | < .01 |
|
| ||||||
| 5-6 | 2.6 (6.4) | 3.3 (7.1) | < .01 | 2.5 (6.3) | 2.8 (6.6) | .07 |
|
| ||||||
| 6-7 | 1.8 (4.3) | 2.1 (4.6) | < .01 | 1.7 (4.6) | 2.0 (4.9) | .30 |
|
| ||||||
| 7-8 | 1.4 (3.2) | 1.6 (3.4) | < .01 | 1.3 (3.5) | 1.5 (3.7) | .90 |
|
| ||||||
| 8-9 | 1.3 (2.8) | 1.5 (3.0) | < .01 | 1.1 (2.9) | 1.2 (3.0) | .06 |
|
| ||||||
| 9-10 | 1.4 (2.9) | 1.6 (3.2) | < .01 | 1.0 (2.6) | 1.1 (2.8) | < .01 |
|
| ||||||
| 4-10 | 9.6 (18.4) | 12.7 (21.5) | < .01 | 10.0 (18.7) | 12.4 (21.2) | < .01 |
a
Data adjusted for birthweight of singleton and presenting twin, maternal age, race, gestational age at delivery, prepregnancy body mass index, admission dilation, and cesarean delivery;
b
Data expressed as median (95%).