Determinants of chronic obstructive pulmonary disease (COPD) in heavy construction workers
| Covariables | OR5-150 | 95% CI |
| Occupation group (tunnel worker vs construction worker) | 2.50 | 1.31 to 4.96 |
| Smoke (current and former vs never) | 2.55 | 1.16 to 6.43 |
| Years employed | ||
| 10–20 vs <10 | 2.56 | 1.13 to 6.32 |
| >20 vs 10–20 | 1.54 | 0.74 to 3.14 |
| Atopy (yes vs no) | 1.15 | 0.44 to 2.66 |
↵5-150 The odds ratios are adjusted for the other covariates.