Table 2 Bivariate and multivariate logistic regression estimation of odds of term infant mortality by contextual county characteristics and individual maternal sociodemographic, health and obstetric characteristics in the US, 2013

  Low

  Medium

1.41***

(1.19, 1.66)

1.39**

(1.17, 1.64)

–

–

1.16

(0.99, 1.36)

  High

1.84***

(1.56, 2.18)

1.90***

(1.60, 2.27)

–

–

1.31***

(1.11, 1.54)

  Large central metro

1.07

(0.93, 1.22)

0.85*

(0.75, 0.96)

–

–

0.98

(0.9, 1.1)

  Large fringe metro

  Medium metro

1.30***

(1.18, 1.46)

1.02

(0.91, 1.15)

–

–

1.05

(0.95, 1.17)

  Small metro

1.23***

(1.08, 1.41)

0.97

(0.84, 1.10)

–

–

0.95

(0.83, 1.08)

  Micropolitan (non-metro) metro

1.55***

(1.37, 1.76)

1.19**

(1.04, 1.35)

–

–

1.10

(0.97, 1.24)

  Non-core (non-metro)

1.72***

(1.51, 1.97)

1.31***

(1.14, 1.50)

–

–

1.16*

(1.02, 1.33)

  37

2.30***

(2.13, 2.48)

–

–

2.12***

(1.95, 2.31)

2.12***

(1.95, 2.31)

  38

1.43***

(1.33, 1.53)

–

–

1.38***

(1.28,1.49)

1.38***

(1.28, 1.49)

  39

  40

0.82***

(0.76, 0.88)

–

–

0.85***

(0.78, 0.92)

0.86***

(0.79, 0.93)

   ≥ 41

0.86**

(0.77, 0.96)

–

–

0.92

(0.81, 1.04)

0.93

(0.82, 1.05)

  15–19

1.62***

(1.48, 1.77)

–

–

1.50***

(1.34, 1.68)

1.47***

(1.31, 1.65)

  20–24

1.39***

(1.30, 1.48)

–

–

1.19***

(1.10, 1.29)

1.18***

(1.09, 1.27)

  25–29

  30–34

0.74***

(0.69, 0.80)

–

–

0.78***

(0.71, 0.85)

0.79***

(0.72, 0.86)

  35–39

0.76***

(0.69, 0.84)

–

–

0.83***

(0.74, 0.92)

0.84**

(0.75, 0.94)

   ≥ 40

1.25**

(1.08, 1.44)

–

–

1.29**

(1.10, 1.52)

1.33**

(1.12, 1.56)

  High school or less

2.47***

(2.31, 2.65)

–

–

1.30***

(1.18, 1.44)

1.27***

(1.15, 1.40)

  Some college/AA

1.81***

(1.68, 1.96)

–

–

1.19***

(1.08, 1.31)

1.17**

(1.06, 1.28)

  Bachelor’s or more

 Maternal race/ethnicity

–

–

  Non-Hispanic White

  Non-Hispanic Black

1.63***

(1.53, 1.74)

–

–

1.19***

(1.10, 1.29)

1.20***

(1.11, 1.31)

  Hispanic

0.84***

(0.78, 0.89)

–

–

0.68***

(0.62, 0.73)

0.68***

(0.63, 0.74)

  Non-Hispanic Other

0.75***

(0.67, 0.84)

–

–

0.87*

(0.76, 0.99)

0.89

(0.78, 1.01)

  No

  Yes

0.53***

(0.51, 0.56)

–

–

0.83***

(0.78, 0.89)

0.83***

(0.78, 0.89)

  0

  1–2

1.22***

(1.15, 1.29)

–

–

1.32***

(1.24, 1.42)

1.31***

(1.23, 1.41)

   ≥ 3

1.83***

(1.70, 1.97)

–

–

1.81***

(1.65, 2.00)

1.78***

(1.61, 1.96)

  Male

  Female

0.84***

(0.80, 0.88)

–

–

0.84***

(0.80, 0.89)

0.84***

(0.80, 0.89)

  First trimester

  Second trimester

1.55***

(1.46, 1.65)

–

–

1.25***

(1.16, 1.34)

1.24***

(1.16, 1.33)

  Third trimester

2.23***

(2.04, 2.44)

–

–

1.71***

(1.55, 1.90)

1.70***

(1.54, 1.89)

  No prenatal care

3.71***

(3.25, 4.23)

–

–

2.12***

(1.80, 2.53)

2.09***

(1.76, 2.49)

  No

  Yes

2.59***

(2.43, 2.76)

–

–

1.79***

(1.65, 1.94)

1.77***

(1.63, 1.91)

  No

  Yes

1.64***

(1.38, 1.94)

–

–

1.32**

(1.07, 1.62)

1.30*

(1.06, 1.60)

  No

  Yes

1.06

(0.95, 1.18)

–

–

1.02

(0.90, 1.15)

1.02

(0 .90, 1.15)

  No

  Yes

1.18**

(1.05, 1.32)

–

–

1.04

(0.91, 1.19)

1.03

(0.90, 1.18)

  No

  Yes

1.95***

(1.85, 2.06)

–

–

1.20***

(1.11, 1.28)

1.18***

(1.10, 1.27)

N

ICC