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Table 7 Geographical stratification. Chronic bronchitis symptoms in the city of Malmö and the area 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 Chronic b. symptoms OR a n Chronic b. symptoms OR a
Heavy traffic No 1767 150(8.5%) 1.00 4178 246(5.9%) 1.00
  Yes 1877 140(7.5%) 0.91(0.71–1.16) 1343 92(6.9%) 1.20(0.94–1.54)
Heaviest road within <100 m no heavy road 586 43(7.3%) 1.00 3124 179(5.7%) 1.00
  <2 cars/min 1021 89(8.7%) 1.21(0.83–1.77) 1193 68(5.7%) 1.00(0.75–1.34)
  2–5 cars/min 837 66(7.9%) 1.10(0.73–1.64) 961 69(7.2%) 1.30(0.98–1.74)
  6–10 cars/min 663 47(7.1%) 0.94(0.61–1.45) 212 19(9.0%) 1.63(0.99–2.69)
  >10 cars/min 537 45(8.4%) 1.22(0.78–1.89) 31 3 -
NOx (μg/m3) 0–8 13 0 - 1824 109(6.0%) 1.00
  8–11 46 4 - 1792 113(6.3%) 1.04(0.79–1.37)
  11–14 562 35(6.2%) 1.00 1268 84(6.6%) 1.17(0.87–1.57)
  14–19 1325 96(7.2%) 1.13(0.76–1.70) 510 26(5.1%) 0.88(0.57–1.37)
  >19 1698 155(9.1%) 1.57(1.06–2.30) 127 6(4.7%) 0.86(0.37–2.01)
    p-trend 0.017   p-trend 0.541
  1. a Adjusted for age, sex, and smoking. [OR(95%CI)].