Table 4.

Induction of Labor Compared to Expectant Management

Week of Induction	IOL CD	Expt mgmt CD	AOR (95% CI)†	Spontaneous Labor CD
38 weeks	11.9%	13.3%	1.80 (1.29 – 2.53)	7.0%*
39 weeks	14.3%	15.0%	1.39 (1.08 – 1.80)	9.1%*
40 weeks	20.4%	19.0%	1.27 (1.00 – 1.62)	10.9%*
41 weeks	24.3%	26.0%	1.26 (0.99 – 1.61)	14.9%*

CD = Cesarean Delivery, Expt Mgmt group includes all women delivered beyond the particular gestational age of the induction of labor comparison group

† Multivariate comparison of cesarean delivery rates between the induction group and the expectant management group. An AOR > 1 implies higher cesarean rates among the expectant management group.

* p-value < 0.01 when compared to IOL at same GA

Multivariate analysis controlling for parity, maternal ethnicity, age, BMI, insurance, education, preeclampsia, diabetes, epidural use, and year of delivery