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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