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Table 4 Geographical stratification. Asthma symptoms in the city of 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 Asthma symptoms OR a n Asthma symptoms OR a
Heavy traffic No 1767 209(11.8%) 1.00 4178 449(10.7%) 1.00
  Yes 1877 263(14.0%) 1.17(0.96–1.43) 1343 178(13.3%) 1.23(1.02–1.49)
Heaviest road within <100 m No heavy road 586 74(12.6%) 1.00 3124 342(10.9%) 1.00
  <2 cars/min 1021 119(11.7%) 0.93(0.68–1.26) 1193 142(11.9%) 1.09(0.88–1.34)
  2–5 cars/min 837 101(12.1%) 0.97(0.70–1.33) 961 112(11.7%) 1.06(0.84–1.33)
  6–10 cars/min 663 97(14.6%) 1.17(0.85–1.63) 212 29(13.7%) 1.24(0.82–1.87)
  >10 cars/min 537 81(15.1%) 1.19(0.84–1.68) 31 2 -
NOx (μg/m3) 0–8 13 1 - 1824 215(11.8%) 1.00
  8–11 46 6 - 1792 205(11.4%) 0.96(0.79–1.18)
  11–14 562 65(11.6%) 1.00 1268 142(11.2%) 0.93(0.74–1.16)
  14–19 1325 146(11.0%) 0.90(0.66–1.23) 510 57(11.2%) 0.95(0.69–1.29)
  >19 1698 254(15.0%) 1.28(0.95–1.72) 127 8(6.3%) 0.50(0.24–1.04)
    p-trend 0.002   p-trend 0.344
  1. a Adjusted for age, sex, and smoking. [OR (95%CI)].