Table 2 Unadjusted and adjusted risk ratios for cesarean delivery

 White - NH

1.00 (Reference)

1.00 (Reference)

 Black - NH

1.04 (0.99, 1.09)

1.13 (1.08, 1.19)

 Asian - NH

1.10 (1.04, 1.17)

1.21 (1.14, 1.28)

 Hispanic

0.88 (0.85, 0.92)

0.99 (0.95, 1.03)

 Native American - NH

0.86 (0.77, 0.96)

0.93 (0.84, 1.04)

  < 20

–

0.81 (0.77, 0.84)

 20–24

–

1.00 (Reference)

 25–29

–

1.21 (1.17, 1.24)

 30–34

–

1.51 (1.45, 1.56)

 35–39

–

1.94 (1.85, 2.02)

  ≥ 40

–

2.31 (2.14, 2.48)

Married Marital Status

–

0.98 (0.95, 1.01)

Urban County of Residence

–

0.94 (0.91, 0.96)

  < 12

–

1.13 (1.07, 1.19)

 High School Degree

–

1.13 (1.09, 1.18)

 Some College

–

1.05 (1.02, 1.08)

 At least College Degree

–

1.00 (Reference)

 Private

–

1.00 (Reference)

 Medicaid

–

0.98 (0.95, 1.01)

 Self-Pay

–

0.89 (0.83, 0.95)

 Other

–

1.02 (0.96, 1.07)

 Underweight (<18.5)

–

0.82 (0.76, 0.88)

 Normal (18.5–24.99)

–

1.00 (Reference)

 Overweight (25–29.99)

–

1.34 (1.30, 1.38)

 Obese (30–39.99)

–

1.76 (1.71, 1.81)

 Morbidly Obese (40–49.99)

–

2.22 (2.13, 2.31)

 Super Obese (≥50)

–

2.88 (2.67, 3.11)

Used Tobacco During Pregnancy

–

0.93 (0.90, 0.96)