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Table 5 Proximity measures to highways and major roads.

From: Spatiotemporal air pollution exposure assessment for a Canadian population-based lung cancer case-control study

Proximity Measure # of People Exposeda # of Years Exposed (Mean ± SD) # of WeightedbYears Exposed (Mean ± SD)
Highways    
≤ 50 m 341 0.5 (2.9) 0.7 (3.9)
≤ 100 m 647 1.1 (4.0) 1.5 (5.4)
≤ 300 m 1640 2.9 (6.3) 4.0 (8.5)
Major Roads    
≤ 50 m 1438 2.3 (5.5) 3.2 (7.6)
≤ 100 m 2283 4.0 (6.9) 5.5 (9.5)
≤ 300 m 4517 10.1 (8.8) 13.8 (12.1)
  1. a Number of individuals living > 1 year within 50/100/300 m of a highway or major road
  2. b Weighted to account for temporal changes in vehicle emissions