Table 4. Clinical features of elderly patients (age>=60 years) with NSCLC in the training and validating groups.
| Features | Training group (n=456) |
Validation group-1 (n=670) |
Validation group-2 (n=130) |
| Age, no (%) | |||
| <75 years | 353 | 486 | 123 |
| >=75 years | 103 | 184 | 7 |
| Gender, no (%) | |||
| Male | 313 (68.6) | 421 (62.8) | 60 (46.2) |
| Female | 143 (31.4) | 249 (37.2) | 70 (53.8) |
| Smoking status, no (%) | |||
| Never smoker | 17 (12.5) | 51 (7.9) | 67 (51.5) |
| Ever smoker | 71 (52.2) | 454 (70.1) | 63 (48.5) |
| Current smoker | 48 (35.3) | 143 (22.0) | |
| Pathological grade, no (%) | |||
| Squamous Carcinoma | 236 (39.9) | 415 (61.9) | NA |
| Adenocarcinoma | 220 (60.1) | 255 (38.1) | NA |
| AJCC stage, no (%) | |||
| I | 313 (68.4) | 356 (53.3) | 97 (74.6) |
| II | 89 (19.6) | 185 (27.6) | 33 (25.4) |
| III | 46 (10.2) | 112 (16.7) | NA |
| IV | 8 (1.8) | 17 (2.4) | NA |
Abbreviations: AJCC, the American Joint Committee on Cancer.