Table 2. Comparison of perioperative results between different groups.
| Perioperative parameters | Overall | Group 1 | Group 2 | Group 3 | Group 4 | F | P |
|---|---|---|---|---|---|---|---|
| Surgical time (min) | 174.2±51.5 | 194.5±39.5 | 177.5±68.7 | 190.3±46.6 | 134.3±22.8 | – | – |
| P* | – | – | 0.428 | 0.549 | 0.012 | 3.379 | 0.029 |
| Blood loss (mL) | 81.9±57.4 | 112.0±74.5 | 68.0±36.8 | 80.5±54.1 | 67.0±54.8 | 1.375 | 0.266 |
| DMN | 13.1±7.0 | 12.6±6.9 | 12.0±5.7 | 16.8±9.0 | 11.0±5.5 | 1.363 | 0.270 |
| Chest duration (days) | 5.9±2.5 | 6.9±3.1 | 5.3±1.9 | 5.4±1.9 | 6.1±2.9 | 0.874 | 0.464 |
| Hospital stay (days) | 4.6±1.5 | 4.2±1.5 | 4.5±1.3 | 4.8±1.1 | 4.8±2.1 | 0.333 | 0.802 |
| Complication | 3 | 2 | 0 | 0 | 1 | – | – |
| Age (years) | 53.7±8.3 | 51.4±8.0 | 52.9±8.4 | 55.9±8.1 | 54.5±9.3 | 0.528 | 0.666 |
| S4 + S5 + S6 | 9 | 2 | 3 | 3 | 1 | – | – |
| Other segments | 31 | 8 | 7 | 7 | 9 | – | 0.635 |
*, P value of the difference of operative time, compared with former group; chest duration, chest drainage duration (days). DMN, dissected mediastinal nodes; S4-S5, lingular segment; S6, superior and basilar segment.