Table 2.

Adjusted Relative Risk for Neonatal Outcomes According to Presence or Absence of Placental Abruption, Consortium on Safe Labor Study, 2002–2008

Neonatal Outcome	No Abruption (n = 219,722)		Abruption (n = 3,619)		RR	99% CIa
	No.	%	No.	%
Composite perinatal-neonatal outcomeb					1.9	1.8, 2.0
No	152,234	69.3	1,195	33.0
Yes	67,488	30.7	2,424	67.0
Newborn resuscitationc					1.5	1.5, 1.6
No	168,614	77.1	2,084	59.8
Yes	49,948	22.9	1,401	40.2
NICU admissionc					3.4	3.2, 3.6
No	193,186	88.4	1,796	51.5
Yes	25,376	11.6	1,689	48.5
NICU LOS, daysc,d	7 (3–17)		20 (7–48)		2.0e	1.9, 2.2e
Respiratory distress syndromec					6.5	5.9, 7.1
No	212,145	97.1	2,599	74.6
Yes	6,417	2.9	886	25.4
Apneac,f					5.8	5.1, 6.5
No	193,982	97.9	2,854	84.9
Yes	4,180	2.1	507	15.1
Asphyxiac					8.5	5.7, 11.3
No	218,051	99.8	3,408	97.8
Yes	511	0.2	77	2.2
Antepartum or intrapartum stillbirth					6.3	4.7, 7.9
No	218,562	99.5	3,485	96.3
Yes	1,160	0.5	134	3.7
Neonatal mortality ≤28 daysc					7.6	5.2, 10.1
No	217,932	99.7	3,395	97.4
Yes	630	0.3	90	2.6

Abbreviations: CI, confidence interval; LOS, length of stay; NICU, neonatal intensive care unit; RR, relative risk.

^a Relative risk estimated with modified Poisson model adjusting for maternal age, race/ethnicity, parity, prepregnancy body mass index, maternal comorbidities (chronic hypertension, gestational hypertension, preeclampsia, pregestational diabetes, and gestational diabetes), insurance, marital status, smoking status, alcohol use, drug use, and study site. All models were significant at P < 0.001.

^b Composite outcome included resuscitation, NICU admission, respiratory distress syndrome, apnea, asphyxia, stillbirth, and neonatal mortality.

^c Excluding antepartum and intrapartum stillbirths.

^d Data are given as median values (interquartile ranges) among those admitted to NICU; excludes sites 4 and 8, which did not report NICU LOS.

^e Incidence rate ratio estimated with negative binomial model.

^f Excluding site 6, which did not report neonatal apnea.