Lung function change in those exposed to dense traffic (>30 000 vehicles per day) versus reference (>500 m)
| Outcome | n | Unadjusted model | p for trend | Adjusted* model | p for trend |
|---|---|---|---|---|---|
| Traffic exposure | % (95% CI) | % (95% CI) | |||
| FEV1 | |||||
| >500 m | 4382 | – | – | ||
| 75–500 m | 1020 | −0.87 (−1.80 to 0.06) | −1.06 (−1.97 to −0.16) | ||
| <75 m | 39 | −1.31 (−5.61 to 2.99) | 0.057 | −2.23 (−6.40 to 1.94) | 0.012 |
| FVC | |||||
| >500 m | 4382 | – | – | ||
| 75–500 m | 1020 | −0.86 (−1.705 to −0.01) | −1.11 (−1.94 to −0.39) | ||
| <75 m | 39 | 1.23 (−2.69 to 5.14) | 0.111 | 0.33 (−3.47 to 4.12) | 0.018 |
*Adjusted for age, gender, BMI, education and smoking status.
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.