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Table 3 Geographical stratification. Asthma diagnosis 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 Asthma diagnosis OR a n Asthma diagnosis OR a
Heavy traffic No 1767 109(6.2%) 1.00 4178 283(6.8%) 1.00
  Yes 1877 161(8.6%) 1.35(1.05–1.75) 1343 119(8.9%) 1.28(1.02–1.61)
Heaviest road within <100 m no heavy road 586 40(6.8%) 1.00 3124 224(7.2%) 1.00
  <2 cars/min 1021 66(6.5%) 0.95(0.63–1.43) 1193 82(6.9%) 0.95(0.73–1.23)
  2–5 cars/min 837 57(6.8%) 0.99(0.65–1.51) 961 75(7.8%) 1.07(0.81–1.40)
  6–10 cars/min 663 50(7.5%) 1.12(0.72–1.72) 212 19(9.0%) 1.21(0.74–1.99)
  >10 cars/min 537 57(10.6%) 1.50(0.98–2.31) 31 2 -
NOx (μg/m3) 0–8 13 1 - 1824 138(7.6%) 1.00
  8–11 46 5 - 1792 138(7.7%) 1.01(0.79–1.30)
  11–14 562 39(6.9%) 1.00 1268 83(6.5%) 0.81(0.61–1.08)
  14–19 1325 76(5.7%) 0.79(0.53–1.18) 510 37(7.3%) 0.93(0.64–1.36)
  >19 1698 149(8.8%) 1.18(0.81–1.71) 127 6(4.7%) 0.58(0.25–1.34)
    p-trend 0.044   p-trend 0.079
  1. a Adjusted for age, sex, and smoking. [OR(95%CI)].