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Table 2 Associations between the number of road segments around the mothers' homes and the four birth outcomes

From: Increased traffic exposure and negative birth outcomes: a prospective cohort in Australia

Birth outcome (scale)

Road type

Radius (metres)

Estimate

95% CI

P-value

Gestation (%)

Freeway

400

-4.4

-8.1,-0.5

0.03

 

Highway

400

-2.5

-5.9,1.0

0.16

 

Main road

400

-1.1

-1.7, -0.5

0.001

Birth weight (g)

Freeway

400

288.2

-164.2, 740.6

0.21

 

Highway

400

126.5

-278.9, 531.9

0.54

 

Main road

400

-37.4

-113.1, 38.2

0.33

Birth length (cm)

Freeway

250

-0.10

-0.77, 0.57

0.76

 

Highway

250

-0.13

-0.59, 0.32

0.57

 

Main road

250

-0.08

-0.16, 0.003

0.06

Head circumference

Freeway

400

-0.70

-2.20, 0.80

0.36

(cm)

Highway

400

0.39

-0.90, 1.62

0.57

 

Main road

400

-0.09

-0.33, 0.15

0.47

  1. Estimates shown for a 10 unit increase in roads. Results after excluding one influential mother.
  2. CI = confidence interval