Number of workers (percentages) with respiratory symptoms, COPD, and asthma in asphalt workers and outdoor construction workers
| Symptom | Asphalt | Outdoor construction | OR* | 95% CI† |
|---|---|---|---|---|
| *OR (odds ratio) adjusted for smoking and age. | ||||
| †95% confidence limits of the odds ratio. | ||||
| Eye irritation | 14 (21.9) | 18 (9.2) | 2.8 | (1.2 to 5.9) |
| Chest tightness | 14 (21.9) | 18 (9.2) | 2.8 | (1.3 to 5.9) |
| Shortness of breath climbing stairs | 7 (10.9) | 6 (3.1) | 4.1 | (1.3 to 13.0) |
| Chest wheezing | 25 (39.1) | 40 (20.5) | 2.6 | (1.4 to 4.9) |
| Asthma diagnosed | 9 (14.1) | 4 (2.1) | 7.9 | (2.3 to 26.8) |
| COPD | 12 (18.8) | 15 (7.7) | 2.8 | (1.2 to 6.5) |