Table 1 Comparison of clinical characteristics of the patients with rectal cancer between learning and validation set
Variable | Learning set (n = 115) | Validation set (n = 45) | p value |
|---|---|---|---|
Patient characteristics | |||
Male sex, n (%) | 73 (63.5) | 29 (64.4) | 0.909 |
Age at surgery, years; median [IQR] | 62 [55–67] | 67 [60–72] | 0.044 |
≥ 75, n (%) | 13 (11.3) | 7 (15.6) | 0.466 |
BMI (kg/m2), median [IQR] | 22.5 [20.4–24.5] | 22.5 [19.3–25.3] | 0.974 |
≥ 25, n (%) | 23 (20.0) | 15 (33.3) | 0.076 |
Neo-adjuvant therapy, n (%) | 21 (18.3) | 8 (17.8) | 0.943 |
Chemoradiotherapy, n (%) | 0 (0) | 1 (2.2) | |
Chemotherapy alone, n (%) | 21 (18.3) | 7 (15.6) | |
Tumor characteristics | |||
Tumor distance from AV, cm; median [IQR] | 10 [6–15] | 10 [6–15] | 0.425 |
T stage (0–2/3, 4) | 60/55 | 21/24 | 0.532 |
N stage (0/1, 2) | 74/41 | 27/18 | 0.609 |
M stage (0/1) | 110/5 | 43/2 | 0.979 |
Surgical details | |||
Surgical approach (robot/laparoscopy) | 24/91 | 15/30 | 0.099 |
Type of surgery (ISR/HAR, LAR) | 13/102 | 1/44 | 0.068 |
Construction of diverting ileostomy, n (%) | 48 (41.7) | 14 (31.1) | 0.216 |
Lateral lymph node dissection n (%) | 22 (19.1) | 6 (13.3) | 0.387 |