| 1000 - 9999 | 10,000 - 99,999 | 100,000 - 999,999 | >1,000,000 | Total | Value p | ||||||
| f | % | f | % | f | % | f | % | ||||
| FEV1 | <80 | 1 | 20.0% | 2 | 18.2% | 4 | 13.3% | 4 | 25.0% | 11 | 0.802 |
| >80 | 4 | 80.0% | 9 | 81.8% | 26 | 86.7% | 12 | 75.0% | 51 | ||
| FVC | <80 | 1 | 20.0% | 2 | 18.2% | 4 | 13.3% | 5 | 31.3% | 12 | 0.541 |
| >80 | 4 | 80.0% | 9 | 81.8% | 26 | 86.7% | 11 | 68.8% | 50 | ||
| FEF25-75 | <65 | 3 | 60.0% | 0 | 0.0% | 6 | 20.0% | 5 | 31.3% | 14 | 0.046 |
| >65 | 2 | 40.0% | 11 | 100.0% | 24 | 80.0% | 11 | 68.8% | 48 | ||
| FEV1/ FVC | <0.90 | 3 | 60.0% | 0 | 0.0% | 4 | 13.3% | 4 | 25.0% | 11 | 0.024 |
| >0.90 | 2 | 40.0% | 11 | 100.0% | 26 | 86.7% | 12 | 75.0% | 51 | ||