Table 1.

Characteristics of women undergoing TOL after two previous cesareans (n = 22,762)

Variable	Vaginal birth (%), n = 12,192	Cesarean (%), n = 10,570	p-Value
Maternal factors
Maternal age
< 35 years	53.6	46.6	0.925
> 35 years	53.5	46.5
Education
No college	52.4	47.6	0.003
Some college	54.4	45.6
Marital status
Not married	49.1	50.9	<0.001
Married	56	44
Insurance
Not Medicaid	56.5	43.5	<0.001
Medicaid	50.8	49.2
Cigarette smoker
No	55	45	0.001
Yes	52.8	47.2
Maternal race/Ethnicity
Caucasian	59	41	<0.001
African-American	47.8	52.2
Hispanic	52.5	47.5
Asian-American	47.2	52.8
BMI
< 18.5 kg/m2	57.5	42.5	<0.001
18.5–24.9 kg/m2	57.2	42.8
25–29.9 kg/m2	52.5	47.5
> 30 kg/m2	49	51
Weight gain
Below IOM guidelines	54.3	45.7	<0.001
Within IOM guidelines	56.1	43.9
Above IOM guidelines	51	49
Previous vaginal delivery
No	47.6	52.4	<0.001
Yes	58.9	41.1
Gestational diabetes
No	50.8	49.2	0.149
Yes	50.1	49.9
Prepregnancy diabetes
No	53.9	46.1	<0.001
Yes	49.3	50.7
Gestational hypertension
No	53.9	46.1	<0.001
Yes	44	56
Chronic hypertension
No	53.6	46.4	0.616
Yes	52.3	47.7
Induction of labor
No	53.1	46.9	<0.001
Yes	57.6	42.4
Gestational age (weeks)			<0.001
360/7–366/7	41.9	58.1
370/7–376/7	45.6	54.4
380/7–386/7	47.5	52.5
390/7–396/7	50.6	49.4
400/7–406/7	69.2	30.8
410/7–416/7	66.4	33.6
420/7–426/7	62.8	37.2

Abbreviations: BMI, body mass index; IOM, Institute of Medicine; TOL, trial of labor.