. Author manuscript; available in PMC: 2020 Apr 7.

Published in final edited form as: Am J Perinatol. 2018 Sep 19;36(6):588–593. doi: 10.1055/s-0038-1670679

Table 2.

Factors associated with vaginal birth following a trial of labor after two previous cesareans (n = 22,762)

Factor	aOR^a	95% CI
Maternal factors
Age > 35 years	0.88	0.81	0.96
Some college education	0.85	0.79	0.92
Married	1.13	1.04	1.23
Medicaid insurance	0.91	0.84	0.99
Cigarette smoker^b	–	–	–
Maternal race/Ethnicity^c
African-American	0.68	0.62	0.76
Hispanic	0.64	0.58	0.70
Asian-American	0.59	0.49	0.71
Weight category^d
Underweight	1.04	0.80	1.35
Overweight	0.87	0.79	0.95
Obese	0.75	0.68	0.82
Weight gain^e
Below IOM guidelines	1.10	0.99	1.21
Above IOM guidelines	0.88	0.81	0.95
Previous vaginal delivery	1.58	1.47	1.70
Gestational diabetes^b	–	–	–
Pre-pregnancy diabetes	0.98	0.85	1.12
Gestational hypertension	0.84	0.69	1.03
Chronic hypertension	1.13	0.84	1.52
Induction of labor	1.08	0.96	1.22
Gestational age (weeks)^f
36^0/7–36^6/7	0.64	0.54	0.76
37^0/7–37^6/7	0.79	0.70	0.89
38^0/7–38^6/7	0.85	0.78	0.94
40^0/7–40^6/7	2.01	1.80	2.26
41^0/7–41^6/7	1.66	1.39	1.98
> 42^0/7	1.32	0.87	1.99

Abbreviations: aOR, adjusted odds ratio; CI, confidence interval; IOM, Institute of Medicine.

Model adjusted for maternal age, college education, Medicaid insurance, cigarette smoking, gestational age, maternal race, maternal weight gain, gestational diabetes, prepregnancy diabetes, gestational hypertension, chronic hypertension, induction of labor, and previous vaginal delivery.

Omitted due to collinearity.

Comparison group: Caucasian.

Comparison group: normal weight.

Comparison group: within IOM Guidelines.

Comparison group: weeks 39^0/7–39^6/7.