Respiratory and atopic outcomes in relation to traffic counts in the area of residence
| Outcome | Crude reference prevalence % (raw numbers) | Exposure tertile | Crude prevalence % (raw numbers) | Adjusted OR (95% CI) |
| Asthma | 10.4 (318/3071) | Low | 9.4 (18/192) | 0.902 (0.545–1.493) |
| Medium | 9.6 (20/208) | 0.931 (0.576–1.506) | ||
| High | 12.2 (24/197) | 1.194 (0.762–1.871) | ||
| Current asthma# | 5.0 (157/3124) | Low | 3.1 (6/196) | 0.607 (0.264–1.396) |
| Medium | 5.7 (12/211) | 1.177 (0.639–2.171) | ||
| High | 8.6 (17/197) | 1.790 (1.051–3.048)§ | ||
| Current wheeze# | 8.6 (266/3085) | Low | 7.3 (14/192) | 0.848 (0.483–1.488) |
| Medium | 8.5 (18/211) | 1.008 (0.609–1.669) | ||
| High | 13.5 (26/193) | 1.663 (1.073–2.578)§ | ||
| Cough¶ | 18.0 (559/3097) | Low | 18.7 (36/193) | 1.049 (0.720–1.528) |
| Medium | 22.3 (47/211) | 1.323 (0.942–1.858) | ||
| High | 26.8 (52/194) | 1.622 (1.162–2.266)ƒ | ||
| Hay fever | 11.7 (360/3082) | Low | 10.9 (21/192) | 0.940 (0.585–1.510) |
| Medium | 12.4 (26/209) | 1.061 (0.688–1.638) | ||
| High | 13.3 (26/196) | 1.171 (0.756–1.814) | ||
| Skinprick test | 19.4 (341/1762) | Low | 17.9 (20/112) | 0.846 (0.509–1.405) |
| ≥3 mm | Medium | 18.2 (22/121) | 0.971 (0.595–1.584) | |
| High | 23.4 (26/111) | 1.373 (0.857–2.200) | ||
| Pollen | 13.9 (243/1754) | Low | 14.2 (16/113) | 0.961 (0.551–1.677) |
| Medium | 14.2 (17/120) | 1.067 (0.619–1.840) | ||
| High | 18.9 (21/111) | 1.567 (0.940–2.613)+ | ||
| Specific IgE | 36.3 (476/1311) | Low | 28.8 (23/80) | 0.682 (0.411–1.130) |
| aeroallergens | Medium | 34.7 (34/98) | 0.933 (0.600–1.453) | |
| ≥0.7 kU·mL−1 | High | 39.5 (32/81) | 1.213 (0.755–1.947) |
OR: odds ratio
CI: confidence interval
Ig: immunoglobulin
low: 2600–15000 vehicles·day−1
medium: 15001–30000 vehicles·day−1
high: >30000 vehicles·day−1 in street segment <50 m away from home
#: with respective symptoms during the last 12 months
¶: morning cough during the last 12months. ORs adjusted for age, sex, socioeconomic status, and family history of asthma, hay fever, or eczema. Traffic categories analysed versus rest of population (reference)
+: p=0.05–≤0.10
§: p=0.01–≤0.05
ƒ: p≤0.01