Logistic regression: relationship between breathlessness in men and ever working in an occupational group with an a priori risk of COPD (as defined for the ECRHS) compared to referent occupations
| ECRHS occupational groups at risk of COPD | Total (n) | Subjects reporting breathlessness (n, %) | Crude OR (95%CI) | Adjusted* OR (95%CI) | p |
| Referent occupations | 654 | 84 (12.8) | 1.0 | 1.0 | na |
| Ever working in an at risk job | 1798 | 379 (21.1) | 1.81 (1.40 to 2.34) | 1.57 (1.21 to 2.04) | 0.001 |
| Cleaning | 120 | 38 (31.7) | 3.14 (2.00 to 4.92) | 2.62 (1.64 to 4.17) | <0.001 |
| Painting | 88 | 26 (29.6) | 2.85 (1.70 to 4.75) | 2.22 (1.30 to 3.80) | 0.003 |
| Agriculture | 190 | 53 (27.9) | 2.63 (1.78 to 3.88) | 2.31 (1.54 to 3.45) | <0.001 |
| Transport | 566 | 151 (26.7) | 2.47 (1.84 to 3.32) | 2.07 (1.52 to 2.81) | <0.001 |
| Food | 128 | 34 (26.6) | 2.45 (1.56 to 3.87) | 1.96 (1.20 to 3.2) | 0.007 |
| Healthcare | 126 | 30 (23.8) | 2.12 (1.33 to 3.39) | 1.96 (1.21 to 3.16) | 0.006 |
| Other manual work | 307 | 76 (24.8) | 2.23 (1.58 to 3.12) | 1.81 (1.26 to 2.60) | 0.001 |
| Wood | 234 | 54 (23.1) | 2.04 (1.39 to 2.98) | 1.81 (1.23 to 2.68) | 0.003 |
| Construction | 389 | 92 (23.7) | 2.10 (1.52 to 2.92) | 1.73 (1.23 to 2.43) | 0.002 |
| Mining | 378 | 81 (21.4) | 1.85 (1.32 to 2.59) | 1.44 (1.01 to 2.04) | 0.045 |
| Metal industries | 586 | 113 (19.3) | 1.62 (1.19 to 2.20) | 1.38 (1.00 to 1.89) | 0.048 |
| Electrical | 293 | 51 (17.4) | 1.43 (0.98 to 2.09) | 1.32 (0.90 to 1.94) | 0.159 |
| Chemical | 110 | 15 (13.6) | 1.07 (0.59 to 1.93) | 0.82 (0.51 to 1.71) | 0.822 |
Crude ORs and *adjusted for age and smoking (by pack year history) are shown.