Associations between traffic density and FEV1, FVC and FEV1/FVC ratio in male ARIC participants (1987–9)
| Quartiles of traffic density | p Value† | ||||
|---|---|---|---|---|---|
| 1 (lowest) | 2 | 3 | 4 | ||
| FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity. | |||||
| *Adjusted for centre, ethnicity, age, smoking status, pack-years of cigarette smoking, environmental tobacco smoke, body mass index, occupation, educational level, census tract-based income, height, square of height and background air pollution level. | |||||
| †p Values for trend based on quartiles scaled by the quartile medians. | |||||
| FEV1 (ml) | |||||
| Age adjusted model | 0 | 58.9 (5.9 to 111.8) | 19.2 (−34.1 to 72.5) | 19.6 (−34.9 to 74.1) | 0.664 |
| Multivariate model* | 0 | 21.2 (−23.7 to 66.0) | −11.2 (−56.7 to 34.2) | 10.2 (−35.9 to 56.3) | 0.994 |
| FVC (ml) | |||||
| Age adjusted model | 0 | 55.2 (−6.6 to 117.0) | 13.2 (−49.0 to 75.5) | 24.8 (−38.9 to 88.5) | 0.956 |
| Multivariate model* | 0 | 16.4 (−34.0 to 66.7) | −21.9 (−73.0 to 29.2) | 11.7 (−40.2 to 63.5) | 0.856 |
| FEV1/FVC (%) | |||||
| Age adjusted model | 0 | 0.3 (−0.3 to 1.0) | 0.4 (−0.3 to 1.0) | 0.3 (−0.4 to 0.9) | 0.892 |
| Multivariate model* | 0 | 0.2 (−0.4 to 0.8) | 0.2 (−0.5 to 0.8) | 0.1 (−0.5 to 0.7) | 0.936 |