Table 3. Unadjusted duration of labor, singleton vs twin gestation (h).
Cervical dilation, cm | Nulliparas | Multiparas | ||||
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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 |
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4-5 | 3.5 (8.4) | 3.8 (8.6) | < .01 | 3.5 (8.1) | 4.4 (9.1) | < .01 |
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5-6 | 2.4 (5.9) | 2.7 (6.2) | < .01 | 2.2 (5.6) | 2.6 (6.0) | < .01 |
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6-7 | 1.7 (4.0) | 1.8 (4.1) | < .01 | 1.5 (4.2) | 1.6 (4.3) | < .01 |
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7-8 | 1.3 (3.0) | 1.5 (3.2) | < .01 | 1.1 (3.0) | 1.1 (3.1) | —b |
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8-9 | 1.2 (2.6) | 1.3 (2.7) | < .01 | 1.0 (2.6) | 1.0 (2.7) | —b |
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9-10 | 1.2 (2.6) | 1.3 (2.8) | < .01 | 0.9 (2.3) | 0.9 (2.3) | —b |
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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.
Data expressed as median (95%);
Results shown are based on the last maximum likelihood iteration.