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Table 2 Asthma diagnosis and asthma 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

   Asthma Diagnosis Asthma Symptoms
   n n (%) OR a n n (%) OR a,
Heavy traffic No 6041 400(6.6%) 1.00 6041 668(11.1%) 1.00
  Yes 3275 286(8.7%) 1.28(1.09–1.50) 3275 447(13.6%) 1.22(1.07–1.39)
Heaviest road within <100 m no heavy road 3755 269(7.2%) 1.00 3755 419(11.2%) 1.00
  <2 cars/min 2235 149(6.7%) 0.92(0.75–1.13) 2235 263(11.8%) 1.05(0.89–1.24)
  2–5 cars/min 1820 134(7.4%) 1.00(0.81–1.25) 1820 216(11.9%) 1.06(0.89–1.26)
  6–10 cars/min 886 69(7.8%) 1.05(0.79–1.38) 886 126(14.2%) 1.25(1.01–1.55)
  >10 cars/min 578 61(10.6%) 1.40(1.04–1.89) 578 85(14.7%) 1.29(1.00–1.67)
NOx (μg/m3) 0–8 1855 140(7.5%) 1.00 1855 217(11.7%) 1.00
  8–11 1855 146(7.9%) 1.04(0.82–1.32) 1855 213(11.5%) 0.97(0.80–1.19)
  11–14 1855 124(6.7%) 0.85(0.66–1.09) 1855 208(11.2%) 0.94(0.77–1.15)
  14–19 1858 115(6.2%) 0.77(0.60–1.00) 1858 206(11.1%) 0.90(0.74–1.11)
  >19 1851 157(8.5%) 1.05(0.83–1.34) 1851 265(14.3%) 1.21(0.99–1.46)
    p-trend 0.84   p-trend 0.026
  1. a Adjusted for age, sex, and smoking. [OR(95%CI)].