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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