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Table 2 Traffic exposure as a risk factor for wheeze, asthma, allergic rhinitis and allergic sensitization expressed as unadjusted odds ratio (OR 95%CI).

From: Heavy vehicle traffic is related to wheeze among schoolchildren: a population-based study in an area with low traffic flows

Traffic exposure Current wheeze Ever wheeze Physician-diagnosed asthma Allergic rhinitis Allergic sensitization Allergic sensitization to any pollen
Heavy traffica ≥100 1.38 (0.97-1.95) 1.22 (0.93-1.60) 1.29 (0.80-2.08) 1.25 (0.91-1.71) 1.13 (0.87-1.47) 0.98 (0.72-1.33)
  ≥250 1.52 (1.04-2.23) 1.18 (0.87-1.60) 1.74 (1.06-2.87) 1.23 (0.87-1.76) 1.35 (1.00-1.81) 1.23 (0.87-1.73)
  ≥500 1.84 (1.17-2.88) 1.30 (0.89-1.90) 1.70 (0.93-3.10) 0.97 (0.60-1.55) 1.12 (0.77-1.63) 1.22 (0.79-1.88)
Total trafficb ≥4000 1.58 (1.09-2.29) 1.21 (0.90-1.63) 1.62 (0.99-2.66) 1.36 (0.97-1.91) 1.19 (0.90-1.59) 1.10 (0.78-1.54)
  ≥8000 1.51 (0.98-2.30) 1.09 (0.76-1.55) 1.48 (0.83-2.61) 1.07 (0.71-1.62) 1.09 (0.77-1.53) 1.10 (0.74-1.64)
Self-reportedc   1.39 (0.98-1.99) 1.52 (1.16-1.99) 1.31 (0.81-2.11) 1.52 (1.11-2.09) 1.38 (1.06-1.80) 1.25 (0.92-1.70)
  1. a Number of heavy vehicles daily within 200 meters from the home (Heavy traffic)
  2. b Total number of vehicles daily within 200 meters from the home (Total traffic)
  3. c A large busy road or a very frequented bus stop within 200 meters of the home