| Covariates | Type | Total | Test | Train | |
| Age | ≤65 | 349 (65.48%) | 181 (68.05%) | 168 (62.92%) | |
| >65 | 184 (34.52%) | 85 (31.95%) | 99 (37.08%) | ||
| Gender | FEMALE | 188 (35.27%) | 90 (33.83%) | 98 (36.7%) | |
| MALE | 345 (64.73%) | 176 (66.17%) | 169 (63.3%) | ||
| Grade | G1 | 14 (2.63%) | 10 (3.76%) | 4 (1.5%) | |
| G2 | 229 (42.96%) | 110 (41.35%) | 119 (44.57%) | ||
| G3 | 206 (38.65%) | 109 (40.98%) | 97 (36.33%) | ||
| G4 | 76 (14.26%) | 33 (12.41%) | 43 (16.1%) | ||
| unknown | 8 (1.5%) | 4 (1.5%) | 4 (1.5%) | ||
| Stage | Stage I | 267 (50.09%) | 134 (50.38%) | 133 (49.81%) | |
| Stage II | 57 (10.69%) | 29 (10.9%) | 28 (10.49%) | ||
| Stage III | 123 (23.08%) | 61 (22.93%) | 62 (23.22%) | ||
| Stage IV | 83 (15.57%) | 40 (15.04%) | 43 (16.1%) | ||
| unknown | 3 (0.56%) | 2 (0.75%) | 1 (0.37%) | ||
| T | T1 | 273 (51.22%) | 138 (51.88%) | 135 (50.56%) | |
| T2 | 69 (12.95%) | 34 (12.78%) | 35 (13.11%) | ||
| T3 | 180 (33.77%) | 88 (33.08%) | 92 (34.46%) | ||
| T4 | 11 (2.06%) | 6 (2.26%) | 5 (1.87%) | ||
| M | M0 | 422 (79.17%) | 212 (79.7%) | 210 (78.65%) | |
| M1 | 79 (14.82%) | 40 (15.04%) | 39 (14.61%) | ||
| unknown | 32 (6%) | 14 (5.26%) | 18 (6.74%) | ||
| N | N0 | 240 (45.03%) | 120 (45.11%) | 120 (44.94%) | |
| N1 | 16 (3%) | 10 (3.76%) | 6 (2.25%) | ||
| unknown | 277 (51.97%) | 136 (51.13%) | 141 (52.81%) | ||