Table 3. Induction of labor compared to expectant management in all women and stratified by parity.

Week of induction (n induction group)	IOL CD	Expectant management CD	AOR (95% CI)	P
37 weeks (n=64)	23.4%	19.1%	1.53 (0.76-3.06)	0.23
38 weeks (n=55)	27.3%	19.7%	2.07 (0.89-4.80)	0.09
39 weeks (n=248)	18.2%	27.7%	0.79 (0.44-1.42)	0.43
Nulliparas
37 weeks (n=29)	37.9%	29.3%	1.17 (0.53-2.63)	0.69
38 weeks (n=23)	47.8%	28.6%	1.29 (0.47-3.40)	0.64
39 weeks (n=131)	30.5%	32.1%	0.83 (0.45-1.50)	0.53
Multiparas
37 weeks (n=35)	11.4%	4.2%	3.52 (0.97-12.8)	0.06
38 weeks (n=32)	12.5%	3.7%	7.47 (1.60-34.8)	0.01
39 weeks (n=117)	4.2%	8.3%	0.44 (0.04-5.24)	0.52

Legend: CD (cesarean delivery); AOR (adjusted odds ratio). Data presented as rates of cesarean delivery in the induction of labor versus expectant management group. The n by each week gestation represents the number of women in each gestational age undergoing induction excluding women who were induced with a diagnosis of hypertensive disorders of pregnancy. Multiple regression models were adjusted for maternal age, pre-pregnancy BMI, and modified bishop score. In addition, the model including all women was also adjusted for nulliparity.