Table 1 Prevalence (%) of conditions, risk factors and exposure to vehicle traffic.

Conditions

Current wheeze

Ever wheeze

Physician-diagnosed asthma

Allergic rhinitis

Allergic sensitization

Allergic sensitization to any pollen

Risk factors

Parental asthma

Parental smoking

Home dampness

Traffic exposure

≥500 heavy vehicles^a

≥250 heavy vehicles^a

≥100 heavy vehicles^a

≥4000 vehicles^b

≥8000 vehicles^b

Self-reported exposure^c