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Table 10 Relation between the exposure proxies and modeled NOx (μg/m3) as a continuous variable.

From: Traffic-related air pollution associated with prevalence of asthma and COPD/chronic bronchitis. A cross-sectional study in Southern Sweden

   Malmö NOx Region outside Malmö NOx
   n Mean SD Median n Mean SD Median
Heavy traffic No 1507 18.0 3.1 17.4 4502 10.2 3.5 9.6
  Yes 1772 19.6 3.2 19.6 1495 12.1 4.5 11.4
Heaviest road within <100 m no heavy road 488 17.6 3.4 17.2 3267 10.1 3.4 9.6
  <2 cars/min 855 18.0 2.9 17.8 1380 9.8 4.3 8.1
  2–5 cars/min 746 18.9 3.3 19.4 1074 12.6 3.8 11.5
  6–10 cars/min 627 18.1 2.8 17.4 259 13.8 2.3 14.03
  >10 cars/min 561 21.9 2.0 22.0 17 19.2 4.4 21.6
NOx (μg/m3) 0–8 13 6.8 1.3 6.8 1824 6.7 1.1 6.8
  8–11 46 10.4 0.8 9.6 1792 9.9 0.8 10.0
  11–14 562 13.5 0.7 13.7 1268 12.8 1.0 12.7
  14–19 1325 16.7 1.3 15.9 510 15.7 1.2 15.3
  >19 1698 21.7 1.3 21.5 127 21.9 3.8 21.2
  Total 3644 18.4 3.6 18.5 5521 10.31 3.6 10.04