| Number (%) | |
| No of attendees | 1302 |
| No of complete datasets obtained | 1273 |
| Smoking status | |
| Smokers | 308 (24) |
| Ex-smokers | 456 (36) |
| Never smokers | 507 (40) |
| Abnormal spirometry: FEV1 ⩽80% of predicted | 261 (20) |
| Obstructive: FEV1 ⩽80% of predicted and FEV1/FVC ⩽70% | 145 (11) |
| Restrictive: FEV1 ⩽80% of predicted and FEV1/FVC> 70% | 116 (9) |
| No of smokers or ex-smokers aged ⩾35 with abnormal spirometry | 178 (27) |
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.