Table 3: Comparison of the clinical findings according to the cause of pneumothorax (n = 125).
| Primary | Secondary | p-value | |
| Cases n. | 103 | 22 | |
| Male/Female n (%) | 92/11 (89/11) | 18/4 (82/18) | p = 0.28 |
| Age (years) | 29.0 ± 10.5 | 55.9 ± 26.2 | p < 0.001* |
| Initial/Recurrence n (%) | 82/21 (80/20) | 20/2 (91/9) | p = 0.36 |
| Smoking never/Former n (%) | 61/42 (59/41) | 13/9 (59/41) | p = 0.51 |
| Collapse rate % | 62.2 ± 19.8 | 55.3 ± 17.9 | p = 0.10 |
| Chest drainage n (%) | 58 (56) | 18 (82) | p = 0.01* |
| Aspiration (+)/(-) n (%) | 22/36 (38/62) | 6/12 (33/67) | p = 0.51 |
| Treatment period (days) | 6.6 ± 2.9 | 7.6 ± 6.6 | p = 0.95 |
| Surgical treatment n (%) | 34 (33) | 3(14) | p = 0.08 |
Data are presented as mean ± SD.