Table 1. Pre-operative patients characteristics.
| Variables | Early-stage group A (n=3,266) | Locally advanced-stage group B (n=454) | P value |
|---|---|---|---|
| Age (mean ± SD) (years) | 67.42±9.42 | 68.44±9.19 | 0.030 |
| Sex [n (%)] | 0.000 | ||
| Male | 1,921 (58.80) | 314 (69.20) | |
| Female | 1,345 (41.20) | 140 (30.80) | |
| FEV1% (mean ± SD) | 94.15±20.93 | 91.32±21.07 | 0.009 |
| FVC% (mean ± SD) | 101.14±22.90 | 98.93±19.63 | 0.057 |
| Tiffenau index (mean ± SD) | 75.22±12.46 | 73.80±13.61 | 0.029 |
| DLCO/VA% (mean ± SD) | 64.57±39.37 | 63.22±37.61 | 0.500 |
| Side [n (%)] | 0.360 | ||
| Right | 1,950 (59.70) | 261 (57.70) | |
| Left | 1,316 (40.30) | 193 (42.30) | |
| Surgical procedure [n (%)] | 0.000 | ||
| Upper lobectomy | 1,938 (59.30) | 225 (49.60) | |
| Median lobectomy | 226 (6.90) | 21 (4.60) | |
| Lower lobectomy | 1,096 (33.50) | 205 (45.10) | |
| Upper bi-lobectomy | 3 (0.15) | 2 (0.50) | |
| Lower bi-lobectomy | 3 (0.15) | 1 (0.20) | |
| Pre-operative chemotherapy | 0 | 113 (24.80) | 0.000 |
SD, standard deviation.