A | Total (n) | 27 | 51 |
| Male (n (%)) | 24 (89) | 45 (88) |
| Mean age at symptom onset (y)2-150
| 34.5 | 35.6 |
| Median months employed (n)2-150
| 30 | 30 |
| Smoked at time of employment (n (%)) | 16 (59) | 23 (45) |
| Smoked at symptom onset (n (%))2-150
| 11 (41) | 14 (27) |
| Mean cigarettes/day at start of employment (n) | 16.4 | 16.8 |
| History of hay fever (n (%)) | 5 (19) | 4 (8) |
| History of eczema (n (%)) | 3 (11) | 3 (6) |
| History of asthma (n (%)) | 1 (4) | 1 (2) |
| History of hay fever, eczema or asthma (n (%)) | 8 (30) | 5 (10) |
B | Total (n) | 7 | 12 |
| Male (n) | 7 | 12 |
| Mean age at diagnosis of 1st case (y)2-151
| 46.8 | 51.6 |
| Median months employed (n)2-151
| 48.2 | 97.2 |
| Smoked at time of employment (n (%))2-152
| 5 (71) | 8 (73) |
| Smoked at symptom onset (n (%))2-151
2-152
| 5 (71) | 5 (45) |
| Mean cigarettes/day at employment (n)2-152
| 16.3 | 15.4 |
| History of hay fever | 0 | 0 |
| History of eczema | 0 | 0 |
| History of asthma | 1 | 0 |