Table 3.

Unadjusted and adjusted estimates of the relationship between selected maternal outcomes and gestational age (37-38 weeks vs. 39 weeks; N=11,255)

Maternal outcomes	Unadjusted Estimates		Adjusted Estimates**
	RR	95% CI	OR	95% CI
Primary composite adverse outcome	1.14	(0.99, 1.30)	1.16	(1.00, 1.34)
Composite severe outcomes*	1.78	(0.78, 4.07)	n/a	n/a
Blood transfusion (intra- or postpartum)	1.34	(0.90, 2.01)	1.46	(0.97, 2.21)
Uterine atony	1.24	(0.98, 1.57)	1.23	(0.96, 1.57)
Uterine dehiscence	1.33	(0.80, 2.21)	1.19	(0.71, 2.00)
Endometritis	0.76	(0.55, 1.04)	0.90	(0.65,1.24)
Wound complication	1.17	(0.83, 1.66)	1.05	(0.73, 1.49)
Uterine artery ligation*	1.31	(0.72, 2.38)	n/a	n/a
Ileus	0.91	(0.47, 1.80)	n/a	n/a
Maternal hospitalization ≥ 5 days	1.79	(1.42, 2.25)	1.96	(1.54, 2.49)

^*Composite of death, uterine rupture and hysterectomy only – there were too few events to conduct an adjusted analysis (n/a)

^**Adjusted for maternal age, race, payor, class A1 diabetic status, smoking status during pregnancy and number of prior cesareans