Table 3.
Survival Analysis for Clinical Characteristics of the Patients
| Parameter | No. of Patients | OS, mo | RFS, mo | ||
|---|---|---|---|---|---|
| Mean (SD) | P Value | Mean (SD) | P Value | ||
| Age, y | |||||
| ≤59 | 186 | 83.5 (2.3) | .771 | 69.0 (3.0) | .151 |
| >59 | 170 | 82.8 (2.3) | 60.6 (3.2) | ||
| Sex | |||||
| Male | 140 | 77.9 (2.9) | .021 | 57.6 (3.5) | .009 |
| Female | 216 | 86.9 (1.8) | 70.2 (2.7) | ||
| pT | |||||
| 1 | 205 | 90.1 (1.6) | <.001 | 74.6 (2.6) | <.001 |
| 2 | 138 | 76.9 (3.0) | 55.3 (3.6) | ||
| 3 | 10 | 31.3 (6.0) | 17.2 (5.1) | ||
| 4 | 3 | 38.5 (9.0) | 14.5 (5.0) | ||
| pN | |||||
| 0 | 259 | 90.9 (1.3) | <.001 | 77.3 (2.2) | <.001 |
| 1 | 24 | 62.4 (5.3) | 36.6 (6.3) | ||
| 2 | 73 | 60.0 (4.6) | 28.8 (3.3) | ||
| 3 | — | — | — | ||
| Stages | |||||
| 1 | 251 | 91.7 (1.3) | <.001 | 79.2 (2.2) | <.001 |
| 2 | 27 | 64.1 (5.2) | 34.3 (6.0) | ||
| 3 | 78 | 59.0 (4.5) | 28.0 (3.0) | ||
| Location | |||||
| Left lobes | 145 | 86.7 (2.3) | .147 | 69.0 (3.4) | .274 |
| Right lobes | 211 | 81.2 (2.2) | 62.8 (2.9) | ||
| Tumor size | |||||
| Small (≤20 mm) | 182 | 90.8 (1.6) | <.001 | 77.1 (2.6) | <.001 |
| Large (>20 mm) | 174 | 74.0 (2.7) | 51.8 (3.2) | ||
| Smoking | |||||
| Nonsmoker | 258 | 86.1 (1.8) | .028 | 69.3 (2.5) | .009 |
| Current/ex-smoker | 98 | 74.3 (3.4) | 53.8 (4.0) | ||
| Operation | |||||
| Partial resection | 24 | 73.3 (2.9) | .469 | 73.1 (3.0) | .028 |
| Segmentectomy | 7 | 54.0 (6.4) | 38.2 (9.6) | ||
| Lobectomy or more | 325 | 83.4 (1.7) | 64.3 (2.3) | ||
| Lymph/vascular invasion | |||||
| No | 266 | 89.3 (1.5) | <.001 | 75.2 (2.3) | <.001 |
| Yes | 90 | 64.5 (4.0) | 35.5 (3.8) | ||
OS, overall survival; RFS, recurrence-free survival.