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Table 3 Associations between the two road measures and three indicators of social class (mother and household smoking, and mother's education)

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

Traffic measure

Dependent variable

Road type

OR

95% CI

P-value

Distance to road (km)

Mother's

Freeway

0.95

0.91,1.00

0.04

 

smoking

Highway

0.97

0.94, 1.01

0.12

  

Main road

1.01

0.83, 1.23

0.94

 

Household

Freeway

0.94

0.91, 0.98

0.004

 

smoking

Highway

0.99

0.96, 1.03

0.70

  

Main road

1.14

0.97, 1.35

0.12

 

Mother's

Freeway

0.99

0.95, 1.03

0.57

 

education

Highway

1.01

0.98, 1.05

0.47

  

Main road

1.10

0.92, 1.32

0.29

Number of road segments

within 400 metres

Mother's

smoking

Freeway

0.83

0.59, 1.17

0.29

  

Highway

1.00

0.82, 1.24

0.96

  

Main road

1.02

0.98, 1.06

0.31

 

Household

Freeway

0.91

0.72, 1.15

0.44

 

smoking

Highway

1.10

0.92, 1.31

0.29

  

Main road

0.99

0.96, 1.03

0.75

 

Mother's

Freeway

1.03

0.83, 1.29

0.77

 

education

Highway

1.08

0.89, 1.31

0.43

  

Main road

1.01

0.97, 1.05

0.53

  1. Odds ratios are on a scale of per km for distance, and per segment for the number of roads.
  2. OR = odds ratio, CI = confidence interval