Table 1 Clinical characteristics of patients in deep-learning set.
Number of linear stapler firings |  ≥ 3 |  ≤ 2 | p value |
|---|---|---|---|
n = 58 (17.7%) | n = 270 (82.3%) | ||
Baseline characteristics | |||
 Age [y] |  |  | 0.218 |
  > 70 | 16 (27.6) | 54 (20.0) |  |
  ≤ 70 | 42 (72.4) | 216 (80.0) |  |
 Gender, n (%) |  |  | 0.084 |
  Male | 46 (79.3) | 181 (67.0) |  |
  Female | 12 (20.7) | 89 (33.0) |  |
 BMI [kg/m2] |  |  | 0.745 |
  > 25 | 17 (29.3) | 72 (26.7) |  |
  ≤ 25 | 41 (70.7) | 198 (73.3) |  |
 Diabetes mellitus, n (%) |  |  | 0.873 |
  Yes | 9 (15.5) | 32 (11.9) |  |
  No | 49 (84.5) | 238 (88.1) |  |
 nCRT, n (%) |  |  | 0.709 |
  Yes | 14 (24.1) | 71 (26.3) |  |
  No | 44 (75.9) | 199 (73.7) |  |
 Operation time [min] |  |  | 0.246 |
  > 150 | 32 (55.2) | 124 (45.9) |  |
  ≤ 150 | 26 (44.8) | 146 (54.1) |  |
 Anastomotic leakage, n (%) |  |  | 0.021 |
  Yes | 14 (24.1) | 34 (12.6) |  |
  No | 44 (75.9) | 236 (87.4) |  |
Biochemical data | |||
 Hemoglobin [g/L] |  |  | 0.893 |
  < 120 | 12 (20.7) | 58 (21.5) |  |
  ≥ 120 | 46 (79.3) | 212 (78.5) |  |
 Albumin [g/L] |  |  | 0.207 |
  < 35 | 8 (13.8) | 22 (8.1) |  |
  ≥ 35 | 50 (86.2) | 248 (91.9) |  |
 CEA [ng/mL] |  |  | 0.007 |
  > 5 | 26 (44.8) | 71 (26.3) |  |
  ≤ 5 | 32 (55.2) | 199 (73.7) |  |
Tumor characteristics | |||
 Distance from anus [cm] |  |  | 0.138 |
  < 5 | 4 (6.9) | 39 (14.4) |  |
  ≥ 5 | 54 (93.1) | 231 (85.6) |  |
 Tumor size [cm] |  |  | 0.004 |
  ≥ 5 | 14 (24.1) | 26 (9.6) |  |
  < 5 | 44 (75.8) | 244 (90.4) |  |
 T stage, n (%) |  |  | 0.865 |
  T ≤ 2 | 14 (24.1) | 68 (25.2) |  |
  T3-4 | 44 (75.9) | 229 (84.8) |  |
 N stage, n (%) |  |  | 0.663 |
  N0 | 30(51.7) | 152 (56.3) |  |
  N+ | 28(48.3) | 118 (43.7) |  |
 CRM (evaluated by MRI), n (%) |  |  | 0.014 |
  Positive | 20 (34.5) | 52 (19.3) |  |
  Negative | 38 (65.5) | 218 (80.7) |  |
