A table to show various proportion of patients found to have airway obstruction on spirometry
| GOLD stage | All patients (n=16) | Patients with IHD (n=13) | Current & ex smokers (n=9) |
| Normal | 6 | 4 | 2 |
| 1 | 6 | 5 | 4 |
| 2 | 3 | 3 | 2 |
| 3 | 1 | 1 | 1 |
| Percentage of patients with obstrctive disease | 62.5% | 69.2% | 77.8% |
| Percentage of patients with normal spirometry | 37.5% | 30.8% | 22.2% |