Table 1.
Patient characteristics in the study
| Variable | Training cohort | Validation cohort |
|---|---|---|
| Age at diagnosis | 69 (53‐74) | 67 (54‐75) |
| Race (%) | ||
| White | 2800 (95.8) | 1209 (96.5) |
| Black | 35 (1.2) | 9 (0.7) |
| Others | 87 (3.0) | 35 (2.8) |
| Sex n (%) | ||
| Male gender | 2202 (75.4) | 974 (77.7) |
| Female gender | 720 (24.6) | 279 (22.3) |
| Marital status n (%) | ||
| Married | 2138 (73.2) | 928 (74.1) |
| Unmarried | 400 (13.7) | 164 (13.1) |
| Others | 384 (13.1) | 161 (12.8) |
| AJCC n (%) | ||
| I | 2307 (78.9) | 984 (78.5) |
| II | 366 (12.5) | 154 (12.3) |
| III | 128 (4.4) | 61 (4.9) |
| IV | 121 (4.2) | 54 (4.3) |
| Tumor site n (%) | ||
| Upper lip | 307 (10.5) | 114 (9.1) |
| Lower lip | 2388 (81.7) | 1029 (82.1) |
| Other | 227 (7.8) | 110 (8.8) |
| Surgery n (%) | ||
| Yes | 2720 (93.1) | 1161 (92.7) |
| No | 202 (6.9) | 92 (7.3) |
| Radiotherapy | ||
| Yes | 326 (11.2) | 137 (10.9) |
| No | 2596 (88.8) | 1116 (89.1) |
Abbreviation: AJCC, American Joint Committee on Cancer.