Table 1.
Patient basic characteristic information.
| LNM | Training | Test | ||||
|---|---|---|---|---|---|---|
| No | Yes | P value | No | Yes | P value | |
| N | 775 | 43 | 333 | 18 | ||
| Age (years) | 53.0 ± 10.8 | 50.9 ± 10.3 | 0.281 | 52.8 ± 11.1 | 48.1 ± 11.9 | 0.115 |
| Tumor size (cm) | 2.9 ± 2.0 | 4.4 ± 2.6 | < 0.001 | 3.1 ± 1.9 | 3.5 ± 2.2 | 0.433 |
| Number of resected nodes | 40.2 ± 13.6 | 46.2 ± 14.7 | 0.009 | 40.6 ± 13.9 | 40.4 ± 12.3 | 0.918 |
| Sex | - | 0.630 | ||||
| Female | 353 (45.5%) | 29 (67.4%) | 144 (43.2%) | 9 (50.0%) | ||
| Male | 422 (54.5%) | 14 (32.6%) | 189 (56.8%) | 9 (50.0%) | ||
| Tumor location | 0.598 | 0.561 | ||||
| Lower | 363 (46.8%) | 18 (41.9%) | 152 (45.6%) | 10 (55.6%) | ||
| Middle | 335 (43.2%) | 19 (44.2%) | 156 (46.8%) | 8 (44.4%) | ||
| Upper | 77 (9.9%) | 6 (14.0%) | 25 (7.5%) | 0 (0.0%) | ||
| Macroscopic type | 0.691 | 0.347 | ||||
| Depressed | 415 (53.5%) | 24 (55.8%) | 170 (51.1%) | 9 (50.0%) | ||
| Flat | 152 (19.6%) | 7 (16.3%) | 61 (18.3%) | 1 (5.6%) | ||
| Elevated | 18 (2.3%) | 0 (0.0%) | 6 (1.8%) | 0 (0.0%) | ||
| Mixed | 190 (24.5%) | 12 (27.9%) | 96 (28.8%) | 8 (44.4%) | ||
| Depth of invasion | 0.007 | 0.017 | ||||
| Lamina propria | 282 (36.4%) | 7 (16.3%) | 105 (31.5%) | 1 (5.6%) | ||
| Muscularis mucosa | 493 (63.6%) | 36 (83.7%) | 228 (68.5%) | 17 (94.4%) | ||
| ymphatic-vascular involvement | < 0.001 | < 0.001 | ||||
| No | 760 (98.1%) | 36 (83.7%) | 323 (97.0%) | 13 (72.2%) | ||
| Yes | 15 (1.9%) | 7 (16.3%) | 10 (3.0%) | 5 (27.8%) | ||
| Ulcer | 0.271 | 0.619 | ||||
| No | 737 (95.1%) | 39 (90.7%) | 310 (93.1%) | 18 (100.0%) | ||
| Yes | 38 (4.9%) | 4 (9.3%) | 23 (6.9%) | 0 (0.0%) | ||