Table 1. Patient characteristics.
| Variable | Lung cancer surgery (n = 4772) | Empyema (n = 43) | % | p-value |
|---|---|---|---|---|
| Total number | 4772 | 43 | 0.90 | |
| Sex | ||||
| Male | 3035 | 37 | 1.22 | 0.002 |
| Female | 1737 | 6 | 0.35 | |
| Age | ||||
| <75 | 3471 | 29 | 0.84 | 0.39 |
| ≥75 | 1301 | 14 | 1.08 | |
| Procedure | ||||
| Pneumonectomy | 91 | 8 | 8.79 | <0.0001 |
| Bi-lobectomy | 111 | 3 | 2.70 | |
| Lobectomy | 3326 | 26 | 0.78 | |
| Segmentectomy | 651 | 5 | 0.77 | |
| Wedge resection | 585 | 1 | 0.17 | |
| Method | ||||
| Thoracotomy | 3405 | 39 | 1.15 | 0.005 |
| Video-assisted thoracic surgery | 1367 | 4 | 0.29 | |
| Sleeve resection | 118 | 2 | 1.69 | 0.355 |
| Induction therapy | 114 | 2 | 1.75 | 0.329 |
| Pathologic stage | ||||
| I | 3290 | 21 | 0.64 | 0.005 |
| II | 652 | 11 | 1.69 | |
| III, IV | 827 | 11 | 1.33 | |
| Histology | ||||
| Squamous cell ca. | 1046 | 16 | 1.53 | 0.009 |
| Non-squamous cell ca. | 3726 | 27 | 0.72 | |
| adenocarcinoma | 3322 | 21 | 0.63 | |
| large cell ca. | 110 | 1 | 0.91 | |
| small cell ca. | 76 | 1 | 1.32 | |
| adenosquamous ca. | 67 | 1 | 1.49 | |
| pleomorphic ca. | 62 | 2 | 3.23 | |
| others | 97 | 1 | 1.03 |