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Table 1 Demographic features of the study group

From: Clinically suspected T4 colorectal cancer may be resected using a laparoscopic approach

  Open surgery Laparoscopic surgery P-value
  n = 222 n = 71  
Age (years)    0.321
 median (range) 61.0 (17–84) 59.0 (36–80)  
Sex    0.372
 Female 96 (43.2 %) 35 (49.3 %)  
 Male 126 (56.8 %) 36 (50.7 %)  
BMI (kg/m2)    0.011
 median (range) 22.6 (15.2-31.3) 23.6 (17.3-31.9)  
ASA score    0.377
 1 90 (40.5 %) 33 (46.5 %)  
 2 + 3 + 4 132 (59.5 %) 38 (53.5 %)  
Preoperative CEA (ng/ml)    0.005
 mean ± SD 9.5 ± 20.6 4.5 ± 8.6  
Previous abdominal operation history    0.169
 Negative 48 (21.6 %) 21 (29.6 %)  
 Positive    
Combined resection of an adjacent organ (%) 73 (32.9 %) 7 (9.9 %) <0.001
Location of tumor (%)    0.956
Right colona 77 (34.70 %) 26 (35.60 %)  
 Left colona 77 (34.70 %) 24 (33.80 %)  
 Rectum 68 (30.60 %) 21 (29.60 %)  
Clinical T4 status    <0.001
 T4a 130 (58.6 %) 58 (81.7 %)  
 T4b 92 (41.4 %) 13 (18.3 %)  
Clinical N status    0.523
 Negative 9 (4.10 %) 4 (5.60 %)  
 Positive 213 (95.90 %) 67 (94.40 %)  
Cancer obstruction (%) 90 (40.5 %) 17 (23.9 %) 0.011
Cancer perforation (%) 23 (10.4 %) 2 (2.8 %) 0.048
  1. CEA Carcinoembryonic antigen
  2. aThe right colon and left colon were divided by the splenic flexure