Variable | Training set (n = 4528) | Validation set (n = 2015) | ||
---|---|---|---|---|
n | % | n | % | |
Age (years) | ||||
 Median (range) | 66 (55–75) | 66 (56–74) | ||
 < 70 | 2748 | 60.7 | 1226 | 60.8 |
 ≥ 70 | 1780 | 39.3 | 789 | 39.2 |
Sex | ||||
 Male | 2741 | 60.5 | 1236 | 61.3 |
 Female | 1787 | 39.5 | 779 | 38.7 |
Race | ||||
 White | 2787 | 61.6 | 1156 | 57.4 |
 Black | 568 | 12.5 | 263 | 13.1 |
 Other | 1173 | 25.9 | 596 | 29.6 |
Location | ||||
 Cardia | 1135 | 25.1 | 364 | 18.1 |
 Non-cardia | 3393 | 74.9 | 1651 | 81.9 |
Grade (histology) | ||||
 Well | 155 | 3.4 | 102 | 5.1 |
 Moderately | 1106 | 24.4 | 483 | 24.0 |
 Poorly | 3267 | 72.2 | 1430 | 71.0 |
AJCC 8th Stage | ||||
 I | 1109 | 24.5 | 517 | 25.7 |
 II | 1513 | 33.4 | 501 | 24.9 |
 III | 1401 | 30.9 | 846 | 42.0 |
 IV | 505 | 11.2 | 151 | 7.5 |
T stage | ||||
 T1 | 736 | 16.3 | 448 | 22.2 |
 T2 | 1676 | 37.0 | 251 | 12.5 |
 T3 | 1407 | 31.1 | 727 | 36.1 |
 T4 | 709 | 15.7 | 589 | 29.2 |
N stage | ||||
 N0 | 1274 | 28.1 | 717 | 35.6 |
 N1 | 1176 | 26.0 | 359 | 17.8 |
 N2 | 1054 | 23.3 | 353 | 17.5 |
 N3 | 1024 | 22.6 | 586 | 29.1 |
M stage | ||||
 M0 | 4023 | 88.8 | 1865 | 92.6 |
 M1 | 505 | 11.2 | 150 | 7.4 |
Tumor size (cm) | ||||
 < 2 | 476 | 10.5 | 328 | 16.3 |
 2–10 | 3620 | 79.9 | 1532 | 76.0 |
 ≥ 10/diffuse | 432 | 9.5 | 155 | 7.7 |
Examined LNs (No.) | ||||
 Median (range) | 23 (19-31) | 24 (19-33) | ||
Radiation | ||||
 No radiation or surgery | 3029 | 66.9 | 1526 | 75.7 |
 Yes | 1499 | 33.1 | 489 | 24.3 |
Chemotherapy | ||||
 No/unknown | 2167 | 47.9 | 873 | 43.3 |
 Yes | 2361 | 52.1 | 1142 | 56.7 |