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Table 1 Comparison of clinical characteristics of the patients with rectal cancer between learning and validation set

From: Development and evaluation of a Japanese prediction model for low anterior resection syndrome after rectal cancer surgery

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
  1. Values are the number of patients unless indicated otherwise
  2. IQR interquartile range, BMI body mass index, AV anal verge