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Frequency distribution of severity of COPD according to TNF-α level
| Serum TNF-α Level | Severity of COPD | Total | |||||
|---|---|---|---|---|---|---|---|
| A | B | C | D | ||||
| Tertile 1 | n | 3 | 9 | 0 | 0 | 12 | |
| % | 25.0% | 75.0% | 0.0% | 0.0% | 100.0% | ||
| Tertile 2 | n | 2 | 9 | 6 | 0 | 17 | |
| % | 11.8% | 52.9% | 35.3% | 0.0% | 100.0% | ||
| Tertile 3 | n | 0 | 0 | 2 | 19 | 21 | |
| % | 0.0% | 0.0% | 9.5% | 90.5% | 100.0% | ||
| Total | n | 5 | 18 | 8 | 19 | 50 | |
| % | 10.0% | 36.0% | 16.0% | 38.0% | 100.0% | ||
