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Table 6 Geographical stratification. COPD diagnosis in Malmö and the region outside.

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

   Malmö Region outside Malmö
   n COPD OR a n COPD OR a
Heavy traffic No 1767 85(4.8%) 1.00 4178 152(3.6%) 1.00
  Yes 1877 103(5.5%) 1.24(0.92–1.67) 1343 69(5.1%) 1.47(1.09–1.97)
Heaviest road within <100 m no heavy road 586 28(4.8%) 1.00 3124 124(4.0%) 1.00
  <2 cars/min 1021 44(4.3%) 0.89(0.55–146) 1193 49(4.1%) 1.06(0.75–1.49)
  2–5 cars/min 837 35(4.2%) 0.89(0.53–1.48) 961 35(3.6%) 0.93(0.64–1.37)
  6–10 cars/min 663 50(7.5%) 1.53(0.95–2.48) 212 10(4.7%) 1.20(0.62–2.35)
  >10 cars/min 537 31(5.8%) 1.34(0.79–2.28) 31 3 -
NOx (μg/m3) 0–8 13 0 - 1824 72(3.9%) 1.00
  8–11 46 2 - 1792 66(3.7%) 0.90(0.64–1.27)
  11–14 562 27(4.8%) 1.00 1268 60(4.7%) 1.26(0.89–1.80)
  14–19 1325 64(4.8%) 0.94(0.59–1.49) 510 18(3.5%) 0.91(0.54–1.55)
  >19 1698 95(5.6%) 1.23(0.79–1.92) 127 5(3.9%) 1.19(0.47–3.02)
    p-trend 0.142   p-trend 0.421
  1. a Adjusted for age, sex, and smoking. [OR (95%CI)].