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Table 5 COPD diagnosis and chronic bronchitis symptoms in relation to traffic.

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

   COPD Diagnosis    Chronic bronchitis symptoms   
   n n, (%) OR a n n, (%) OR a
Heavy traffic No 6041 243(4.0%) 1.00 6041 401(6.6%) 1.00
  Yes 3275 172(5.3%) 1.36(1.10–1.67) 3275 234(7.1%) 1.11(0.94–1.31)
Heaviest road within <100 m no heavy road 3755 153(4.1%) 1.00 3755 222(5.9%) 1.00
  <2 cars/min 2235 95(4.3%) 1.04(0.80–1.35) 2235 159(7.1%) 1.21(0.98–1.50)
  2–5 cars/min 1820 71(3.9%) 0.96(0.72–1.28) 1820 137(7.5%) 1.30(1.04–1.62)
  6–10 cars/min 886 60(6.8%) 1.57(1.15–2.14) 886 67(7.6%) 1.24(0.93–1.65)
  >10 cars/min 578 34(5.9%) 1.64(1.11–2.41) 578 48(8.3%) 1.53(1.10–2.13)
NOx (μg/m3) 0–8 1855 74(4.0%) 1.00 1855 110(5.9%) 1.00
  8–11 1855 68(3.7%) 0.89(0.63–1.24) 1855 118(6.4%) 1.05(0.81–1.38)
  11–14 1855 87(4.7%) 1.19(0.86–1.64) 1855 121(6.5%) 1.12(0.86–1.46)
  14–19 1858 83(4.5%) 1.03(0.74–1.42) 1858 122(6.6%) 1.06(0.81–1.39)
  >19 1851 101(5.5%) 1.43(1.04–1.95) 1851 162(8.8%) 1.55(1.21–2.00)
    p-trend 0.010   p-trend <0.0001
  1. a Adjusted for age, sex, and smoking. [OR(95%CI)].