Figure 1

Traffic exposure as a risk factor for current wheeze and physician-diagnosed asthma respectively. Risk expressed as adjusted odds ratios (OR 95%CI), calculated by multiple logistic regression analyses and adjusted for parental smoking, parental asthma, home dampness, sex and socio-economic status.^a Number of heavy vehicles daily within 200 meters from the home^b Total number of vehicles daily within 200 meters from the home.