Table 3.

Adjusted duration of labor in preterm nulliparas by presence of fetal anomaly with median traverse times reported as hours (95th percentile)

	No anomaly (N = 3,628)	Anomaly (N = 562)	p-Value for trend
Cervical dilation, cm
3–4	4.8 (14.4)	5.8 (18.8)	0.002
4–5	4.3 (12.8)	4.6 (13.8)	0.002
5–6	4.0 (12.4)	4.0 (12.9)	<0.0001
6–7	3.5 (10.6)	2.2 (10.2)	0.58
7–8	2.7 (8.0)	3.7 (11.1)	0.001
8–9	2.0 (5.2)	1.8 (5.1)	0.13
9–10	1.5 (4.1)	1.8 (6.0)	0.002
4–10	5.0 (14.2)	5.4(16.7)	<0.0001
Second stage without epidural	0.4 (2.4)	0.3 (2.1)	0.20
Second stage with epidural	0.8 (3.1)	0.9 (4.4)	<0.005

Note: Adjusted model controlled for age, BMI, race, induction, augmentation, epidural (first stage only), and birth weight.