Table 1.
Demographic and clinical characteristics of the test and validation cohorts
| Variables | Test cohort (N=358) | Validation cohort (N=400) | X2 | P |
|---|---|---|---|---|
| Age | 0.22 | 0.639 | ||
| ≥60 years | 160 (44.69%) | 172 (43%) | ||
| <60 years | 198 (55.31%) | 228 (57%) | ||
| Gender | 0.294 | 0.587 | ||
| Male | 195 (54.47%) | 210 (52.5%) | ||
| Female | 163 (45.53%) | 190 (47.5%) | ||
| Distance from the tumor to the anus | 0.696 | 0.404 | ||
| ≤7 cm | 197 (55.03%) | 208 (52%) | ||
| >7 cm | 161 (44.97%) | 192 (48%) | ||
| TNM Stage | 0.512 | 0.474 | ||
| ≥IIIa stage | 165 (46.09%) | 174 (43.5%) | ||
| ≤IIb stage | 193 (53.91%) | 226 (56.5%) | ||
| Preoperative albumin | 0.931 | 0.335 | ||
| ≤35 g/L | 19 (5.31%) | 28 (7%) | ||
| >35 g/L | 339 (94.69%) | 372 (93%) | ||
| Preoperative anemia | 0.693 | 0.405 | ||
| Yes | 41 (11.45%) | 49 (12.25%) | ||
| No | 317 (88.55%) | 351 (87.75%) | ||
| Preoperative obstruction | 0.372 | 0.542 | ||
| Yes | 49 (13.69%) | 61 (15.25%) | ||
| No | 309 (86.31%) | 339 (84.75%) | ||
| Diabetes | 2.9 | 0.089 | ||
| Yes | 25 (6.98%) | 42 (10.5%) | ||
| No | 333 (93.02%) | 358 (89.5%) | ||
| Neoadjuvant chemotherapy | 1.489 | 0.222 | ||
| Yes | 16 (4.47%) | 26 (6.5%) | ||
| No | 342 (95.53%) | 374 (93.5%) | ||
| Defunctioning stoma | 0.864 | 0.353 | ||
| Yes | 63 (17.6%) | 81 (20.25%) | ||
| No | 295 (82.4%) | 319 (79.75%) |
TNM: Tumor-Node-Metastasis.