Table 1 Patient characteristics in the study
Characteristics | Training set (n = 4034) | Validation set (n = 1729) | ||
|---|---|---|---|---|
n | % | n | % | |
age (years) | ||||
 Mean | 62.8. ± 11.6 | 62.5 ± 11.4 | ||
 Range | 22–92 | 17–94 | ||
Sex | ||||
 Male | 2905.0 | 72.0 | 1285.0 | 74.3 |
 Female | 1129.0 | 28.0 | 444.0 | 25.7 |
Race | ||||
 White | 2805.0 | 69.5 | 1215.0 | 70.3 |
 Black | 516.0 | 12.8 | 207.0 | 12.0 |
 Others | 713.0 | 17.7 | 307.0 | 17.7 |
Marital | ||||
 Married | 2811.0 | 69.7 | 1191.0 | 68.9 |
 Single/Domestic Partner | 475.0 | 11.8 | 239.0 | 13.8 |
 DWS | 748.0 | 18.5 | 299.0 | 17.3 |
Prime Site | 0.0 | |||
 cardia | 1698.0 | 42.1 | 756.0 | 43.7 |
 pylorus | 1392.0 | 34.5 | 571.0 | 33.0 |
 others or primary site unknown | 944.0 | 23.4 | 402.0 | 23.3 |
Grade | ||||
 Well | 131.0 | 3.2 | 55.0 | 3.2 |
  Moderately | 1353.0 | 33.5 | 583.0 | 33.7 |
 Poorly | 2471.0 | 61.3 | 1053.0 | 60.9 |
 Undifferentiated | 79.0 | 2.0 | 38.0 | 2.2 |
Primary T category | ||||
 T1 | 353.0 | 8.8 | 141.0 | 8.2 |
 T2 | 2267.0 | 56.2 | 984.0 | 56.9 |
 T3 | 1093.0 | 27.1 | 477.0 | 27.6 |
 T4 | 321.0 | 8.0 | 127.0 | 7.3 |
Primary N category | ||||
 N0 | 925.0 | 22.9 | 373.0 | 21.6 |
 N1 | 2145.0 | 53.2 | 939.0 | 54.3 |
 N2 | 728.0 | 18.0 | 317.0 | 18.3 |
 N3 | 236.0 | 5.9 | 100.0 | 5.8 |
Primary M category | ||||
 M0 | 3614.0 | 89.6 | 1558.0 | 90.1 |
 M1 | 420.0 | 10.4 | 171.0 | 9.9 |
Summary stage | ||||
 Localized | 565.0 | 14.0 | 225.0 | 13.0 |
 Regional | 2915.0 | 72.3 | 1281.0 | 74.1 |
 Distal | 554.0 | 13.7 | 223.0 | 12.9 |
Radiation recode | 0.0 | |||
 Yes | 1800.0 | 44.6 | 772.0 | 44.7 |
 No/Unknown | 2234.0 | 55.4 | 957.0 | 55.3 |
RNE | ||||
 mean | 18.2 ± 11.9 | 18.2 ± 11.7 | ||
 range | 1–87 | 1–77 | ||
RNP | ||||
 median | 2 | 2 | ||
 range | 0–79 | 0–51 | ||
AJCC | ||||
 I | 846.0 | 21.0 | 355.0 | 20.5 |
 II | 1333.0 | 33.0 | 574.0 | 33.2 |
 III | 1078.0 | 26.7 | 477.0 | 27.6 |
 IV | 777.0 | 19.3 | 323.0 | 18.7 |