| Obstructed subjects | Respiratory morbidity | Subject to analysis (n) | ||
| Baseline (n) | 5 years (n) | 5 years n (%) | ||
| No COPD or asthma | 9 | 296 (63.8) | 287 | |
| Mild COPD | 12 | 60 | 60 (12.9) | 48 |
| Moderate COPD | 10 | 49 | 49 (10.6) | 39 |
| At risk for COPD | 1 | 7 (1.5) | ||
| Asthmatic | 3 | 6 | 21 (4.5) | |
| Missing | 31 (6.7) | |||
| Total | 35 | 115 | 464 (100) | 374 |
COPD, chronic obstructive pulmonary disease.