TABLE 1.
Baseline characteristics of the included patients
| Variables | Training cohort | Validation cohort | P value |
|---|---|---|---|
| No. (%) | No. (%) | ||
| No. of patients | 1007 | 504 | |
| Age (years) | 58 (48, 67) | 57 (48, 66) | 0.360 |
| T stage | |||
| T1 | 272 (27.0) | 135 (26.8) | 0.959 |
| T2 | 573 (56.9) | 283 (56.1) | |
| T3 | 125 (12.4) | 69 (13.7) | |
| T4 | 34 (3.4) | 16 (3.2) | |
| Tx | 3 (0.3) | 1 (0.2) | |
| N stage | |||
| N0 | 465 (46.2) | 231 (45.8) | 0.872 |
| N1 | 345 (34.3) | 166 (32.9) | |
| N2 | 109 (10.8) | 64 (12.7) | |
| N3 | 71 (7.0) | 35 (7.0) | |
| Nx | 17 (1.7) | 8 (1.6) | |
| TNM stage | |||
| I | 176 (17.5) | 231 (45.8) | 0.912 |
| II | 567 (56.3) | 166 (32.9) | |
| III | 224 (22.2) | 64 (12.7) | |
| IV | 18 (1.8) | 35 (7.0) | |
| Unknown | 22 (2.2) | 8 (1.6) | |
Abbreviation: TNM, tumour‐node‐metastasis.