Table 1 Baseline clinicopathological characteristics of all patients and those in the training and validation cohort
Variables | All cohorts (n = 3522) | Training cohort (n = 2466) | Validation cohort (n = 1056) |
|---|---|---|---|
Age | |||
 30–49 | 153 (4.3%) | 100 (4.1%) | 53 (5.0%) |
 50–69 | 2228 (63.3%) | 1567 (63.5%) | 661 (62.6%) |
 ≥ 70 | 1141 (32.4%) | 799 (32.4%) | 342 (32.4%) |
Race | |||
 White | 2972 (84.4%) | 2079 (84.3%) | 893 (84.6%) |
 Black | 391 (11.1%) | 275 (11.2%) | 116 (11.0%) |
 Others | 159 (4.5%) | 112 (4.5%) | 47 (4.4%) |
Sex | |||
 Male | 1877 (53.3%) | 1292 (52.4%) | 585 (55.4%) |
 Female | 1645 (46.7%) | 1174 (47.6%) | 471 (44.6%) |
T stage | |||
 T0 | 49 (1.4%) | 34 (1.4%) | 15 (1.4%) |
 T1 | 366 (10.4%) | 246 (10.0%) | 120 (11.4%) |
 T2 | 878 (24.9%) | 592 (24.0%) | 286 (27.1%) |
 T3 | 779 (22.1%) | 560 (22.7%) | 219 (20.7%) |
 T4 | 1450 (41.2%) | 1034 (41.9%) | 416 (39.4%) |
N stage | |||
 N0 | 487 (13.8%) | 336 (13.6%) | 151 (14.3%) |
 N1 | 269 (7.6%) | 186 (7.6%) | 83 (7.9%) |
 N2 | 1928 (54.8%) | 1362 (55.2%) | 566 (53.6%) |
 N3 | 838 (23.8%) | 582 (23.6%) | 256 (24.2%) |
Marriage | |||
 Unmarried | 1713 (48.6%) | 1191 (48.3%) | 522 (49.4%) |
 Married | 1809 (51.4%) | 1275 (51.7%) | 534 (50.6%) |