Table 1.
Comparison of the training and testing sets.
| Variables | Training Set (n = 1328) | Testing Set (n = 332) | p Value |
|---|---|---|---|
| Male, n (%) | 983 (74.0%) | 242 (72.9%) | 0.626 |
| Age, mean (SD), years | 58.94 (9.80) | 59.66 (10.71) | 0.242 |
| BMI, mean (SD), kg/m2 | 21.01 (2.65) | 21.02 (2.76) | 0.930 |
| Hypertension, n (%) | 312 (23.5%) | 67 (20.2%) | 0.214 |
| Diabetes, n (%) | 88 (6.6%) | 23 (6.9%) | 0.807 |
| Previous abdominal surgery, n (%) | 260 (19.6%) | 60 (18.1%) | 0.586 |
| Brinkman index, mean (SD) | 221.34 (412.59) | 199.94 (316.26) | 0.388 |
| Alcohol use, n (%) | 272 (20.5%) | 64 (19.3%) | 0.648 |
| Hemoglobin, mean (SD), g/L | 119.96 (22.17) | 120.24 (23.73) | 0.839 |
| Albumin, mean (SD), g/L | 38.46 (4.57) | 38.74 (4.90) | 0.325 |
| Tumor size, mean (SD), cm | 4.34 (2.33) | 4.36 (2.40) | 0.881 |
| Tumorous obstruction, n (%) | 226 (17.0%) | 58 (17.5%) | 0.871 |
| Neoadjuvant, n (%) | 33 (2.5%) | 7 (2.1%) | 0.842 |
| Total gastrectomy, n (%) | 898 (67.6%) | 237 (71.4%) | 0.210 |
| Esophagogastrostomy, n (%) | 424 (31.9%) | 89 (26.8%) | 0.073 |
| Combined resection, n (%) | 68 (5.1%) | 21 (6.3%) | 0.413 |
| Laparoscopic surgery, n (%) | 1133 (85.3%) | 283 (85.2%) | 1.000 |
| Blood loss, mean (SD), ml | 146.95 (252.80) | 140.66 (222.05) | 0.678 |
| Intraperitoneal chemotherapy, n (%) | 979 (73.7%) | 254 (76.5%) | 0.326 |
| Nasogastric tube, n (%) | 1305 (98.3%) | 323 (97.3%) | 0.263 |
| Indwelling drainage tube, n (%) | 1317 (99.2%) | 325 (97.9%) | 0.068 |
| Operative time, mean (SD), minutes | 304.28 (60.71) | 312.17 (63.11) | 0.036 |
| ASA | 0.083 | ||
| 1 | 205 (15.4%) | 48 (14.5%) | |
| 2 | 971 (73.1%) | 233 (70.2%) | |
| 3 | 145 (10.9%) | 51 (15.4%) | |
| 4 | 7 (0.5%) | 0 (0.0%) | |
| Clinical stages | 0.353 | ||
| 1 | 200 (15.0%) | 49 (14.8%) | |
| 2 | 454 (34.2%) | 108 (32.5%) | |
| 3 | 608 (45.8%) | 150 (45.2%) | |
| 4 | 66 (5.0%) | 25 (7.5%) | |
| AL | 25 (1.9%) | 11 (3.3%) | 0.087 |
SD, standard deviation; BMI, body mass index; ASA, American Society of Anesthesiologists score; AL, anastomotic leakage.