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Table 2 Characteristics of the MIE and open groups

From: Learning curve for minimally invasive oesophagectomy of oesophageal cancer and survival analysis

  MIE group Open group P value
Cases 157 170  
Proportion of males (%) 83 82 0.794
Age mean (SD) 63.4 (9.2) 62.0 (7.6) 0.933
Proportion of smokers (%) 79 76 0.503
Neoadjuvant therapy (%) 16 10 0.110
Histological type
Squamous Cell Carcinoma 155 163  
Adenocarcinoma 1 5  
Small cell carcinoma 1 2 0.638
Differentiation grade    
Moderate to well-differentiated 59 63  
Poorly differentiated 98 107 0.922
Pathological stage
I 6 18  
II 80 82  
III 71 70 0.063
Negative margin 98.73% 100% 0.230
Bleeding volume (ml) 187.2 ± 88.6 241.8 ± 127.4 0.0000
Operation time (mins) 246.1 ± 53.9 262.7 ± 65.4 0.0132
Complication rate (%) 24.2 40 0.359
Cervical anastomotic fistula (%) 9.5 (9/95) 5.5 (2/36) 0.726
Chest anastomotic fistula (%) 3.2 (2/62) 0.75 (1/134) 0.236
laryngeal nerve injury (%) 3.8 2.4 0.527
pulmonary inflammation 12.1 (19/157) 29.4(50/170) 0.0000
Mortality within 3 months (%)  0 0  
Lymph nodes dissection 21.26 ± 7.72 23.99 ± 10.15 0.0069
Node station 4.87 ± 1.43 4.16 ± 1.26 0.0000
No.106rec (right or left) (%) 78.4 (123/157) 23.5 (40/170) 0.0000
No.106rec (right and left) (%) 64.7 (102/157) 7.1 (12/170) 0.0000
No.106tbL node dissection (%) 31.8(50/157) 16.5(28/170) 0.001
Left gastric artery lymph nodes (%) 12.1 (19/157) 47.1 (80/170) 0.0000
No.107 node dissection (%) 80.4 (126/157) 80.0 (136/170) 0.937
Paraesophageal lymph nodes (including No.105, No.108, No.110)
Dissection (%) 90.4 (142/157) 92.9 (158/170) 0.413
Paracardia lymph nodes
Dissection (%) 41.4 (65/157) 42.4 (72/170) 0.862
Paragastric lymph nodes
Dissection (%) 47.1 (74/157) 47.1 (80/170) 0.278