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| NIV group (n = 15) | Control group (n = 14) | P value | |
|---|---|---|---|
| Male (%) | 10 | 10 | 1.00 |
| Age (mean ± SD) | 57.5 ± 15.1 | 61.6 ± 12.5 | 0.14 |
| Malignant (%) | 10 | 10 | 1.00 |
| Rise of enhanced CT value | 33.1 ± 10.1 | 35.1 ± 11.9 | 0.63 |
| Site of obstruction | |||
| trachea(%) | 7 | 6 | 1.00 |
| bronchus(%) | 8 | 8 | 1.00 |
| Hypertension | 4 | 4 | 1.00 |
| Coronary heart disease(%) | 2 | 2 | 1.00 |
| COPD | 4 | 3 | 1.00 |
