Table 1.
Comparison of demographic and baseline characteristics in the training set
| Lymph Node Positive group (n = 231) | Lymph Node Negative group (n = 614) | t/χ2 | P | |
|---|---|---|---|---|
| Age (years) | 59.85 ± 2.65 | 60.21 ± 2.97 | 1.694 | 0.091 |
| Female/Male | 127 (54.98%)/104 (45.02%) | 380 (61.89%)/234 (38.11%) | 3.34 | 0.068 |
| Body Mass Index (kg/m2) | 23.51 ± 1.35 | 23.49 ± 1.47 | 0.142 | 0.887 |
| Smoking history (Yes/No) | 89 (38.53%)/142 (61.47%) | 251 (40.88%)/363 (59.12%) | 0.386 | 0.534 |
| Drinking history (Yes/No) | 61 (26.41%)/170 (73.59%) | 154 (25.08%)/460 (74.92%) | 0.155 | 0.693 |
| Hypertension (Yes/No) | 41 (17.75%)/190 (82.25%) | 135 (21.99%)/479 (78.01%) | 1.828 | 0.176 |
| Diabetes (Yes/No) | 49 (21.21%)/182 (78.79%) | 163 (26.55%)/451 (73.45%) | 2.542 | 0.111 |
| Educational level (Junior college graduate or lower/College graduate or higher) | 61 (26.41%)/170 (73.59%) | 174 (28.34%)/440 (71.66%) | 0.312 | 0.576 |
| Marital Status (Married/Unmarried) | 204 (88.31%)/27 (11.69%) | 553 (90.07%)/61 (9.93%) | 0.553 | 0.457 |
| Ethnicity (Han/Other) | 59.85 ± 2.65 | 60.21 ± 2.97 | 1.694 | 0.091 |
| Tumor length (> 2 cm/≤ 2 cm) | 127 (54.98%)/104 (45.02%) | 380 (61.89%)/234 (38.11%) | 3.340 | 0.068 |
| Tumor location | 13.543 | 0.001 | ||
| Upper Stomach | 6 (2.6%) | 64 (10.42%) | ||
| Middle Stomach | 47 (20.35%) | 113 (18.4%) | ||
| Lower Stomach | 178 (77.06%) | 437 (71.17%) | ||
| Tumor Invasion Depth (Submucosa /Mucosa) | 184 (79.65%)/47 (20.35%) | 306 (49.84%)/308 (50.16%) | 61.253 | < 0.001 |
| Vascular Invasion (Yes/No) | 137 (59.31%)/94 (40.69%) | 254 (41.37%)/360 (58.63%) | 21.728 | < 0.001 |
| Perineural Invasion (Yes/No) | 216 (93.51%)/15 (6.49%) | 268 (43.65%)/346 (56.35%) | 170.514 | < 0.001 |
| Tumor Differentiation | 9.118 | 0.010 | ||
| Poorly Differentiated | 122 (52.81%) | 314 (51.14%) | ||
| Moderately Differentiated | 79 (34.2%) | 168 (27.36%) | ||
| Well Differentiated | 30 (12.99%) | 132 (21.5%) |