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Table 1 Demographic data before and after propensity score matching of patients who underwent robotic reduced-port and conventional four-port gastrectomy

From: Reduced-port robotic radical gastrectomy for gastric cancer: a single-institute experience

  Before propensity matching After propensity matching
  Reduced- port Conventional four-port p values Reduced- port Conventional four-port p values
Patient, n 10 38   10 20  
Age, median [IQR] 70 [64,78] 74 [62,81] 0.732 70 [64,78] 70 [63,78] 0.947
Sex, female, n 2 (20) 18 (47) 0.16 2 (20) 5 (25) 1
BMI, median [IQR] 23 [22, 25] 24 [21, 25] 0.99 23 [22, 25] 23 [21, 26] 0.965
 C stage, n, I 3 (30) 15 (40) 1 3 (30) 5 (25) 1
II 2 (20) 5 (13)   2 (20) 4 (20)  
III 5 (50) 18 (47)   5 (50) 11 (55)  
Total LN retrieved [IQR] 41 [29, 45] 31 [24, 40] 0.264 41 [29, 45] 31 [28,39] 0.28
Metastatic LN 2 [0, 14] 1 [0, 7] 0.568 2 [0, 14] 1 [0, 6] 0.682
p stage, n I 2 (20) 15 (39.5) 0.365 2 (20) 7 (35) 0.696
II 3 (30) 5 (13.2)   3 (30) 4 (20)  
III 5 (50) 18 (47.4)   5 (50) 9(45)  
Operation method, n    1    1
Distal gastrectomy 7 (70) 29 (76.3)   7 (70) 14 (70)  
Total gastrectomy 3 (30) 9 (23.7)   3 (30) 6 (30)  
Operative time, min, median [IQR] 450 [398, 473] 420 [360, 525] 0.684 450 [398, 473] 437 [365, 535] 0.912
Anastomosis method    1    0.693
BII 7 (70) 25 (66)   7 (70) 11 (55)  
Roux-en-Y 3 (30) 13 (34)   3 (30) 9 (45)  
Blood loss, ml    0.666    1
> 50 cc 8 (80) 32 (84.2)   8 (80) 15 (75)  
< 50 cc 2 (20) 6 (15.8)   2 (20) 5 (25)  
LOS, day, median [IQR] 16 [12, 22] 15 [11, 20] 0.859 16 [12, 22] 14 [11, 17] 0.659
Post-op complication    1    1
< Grade IIIa 10 (100) 35 (92.1)   10 (100) 19 (95)  
≥ Grade III 0 (0) 3 (7.9)   0 (0) 1 (5)  
NRS 1, median [IQR] 5 [4, 6] 3.5 [2, 5] 0.068 4.5 [4, 5.75] 3 [2, 4.25] 0.047
NRS 2, median [IQR] 4 [3, 5] 3 [2, 4] 0.2 4 [3, 5] 3 [2, 4] 0.2
NRS 3, median [IQR] 4 [2, 5] 3 [2, 4] 0.131 4 [2, 5] 3 [2, 4] 0.178
  1. aIncluding no complication, grade I and II postoperative complication