Table 4.

Odds Ratios for Each Hour of the Latent Phase^*

Outcome	Crude OR (95% CI)	p-value	Adjusted** OR (95% CI)	p-value
Vaginal delivery	0.94 (0.91, 0.97)	<0.001	0.94 (0.91, 0.98)	0.001
Chorioamnionitis/ Endometritis	1.13 (1.09, 1.18)	<0.001	1.12 (1.07, 1.17)	<0.001
Uterine atony	1.13 (1.07, 1.19)	<0.001	1.13 (1.06, 1.19)	<0.001
NICU admission	1.03 (0.96, 1.09)	0.43	1.03 (0.96, 1.09)	0.46
NICU admission >48 hours	1.00 (0.92, 1.10)	0.94	1.01 (0.92, 1.10)	0.90
Neonatal composite#	1.00 (0.93, 1.09)	0.95	1.01 (0.93, 1.10)	0.81

OR = odds ratio, CI = confidence interval

^*1,290 women who achieved the active phase of labor

^**Odds ratios adjusted for maternal race/ethnicity, gestational age at delivery, body mass index at delivery, and study treatment arm

^#Any of the following: a 5-minute Apgar score below 4, an umbilical artery pH under 7.0, seizures, intubation in the delivery room, stillbirth, neonatal death, or admission to a neonatal intensive care unit for more than 48 hours