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Table 1 Baseline characteristics of the 1046 patients who underwent ESD before propensity score-matching

From: Propensity score-matching analysis to compare clinical outcomes of endoscopic submucosal dissection for early gastric cancer in the postoperative and non-operative stomachs

  ESD-P ESD-N p ASD
n = 41 n = 1005
Age    0.83  
 Mean ± SD 70.4 ± 9.16 71.0 ± 8.82   
 Median (range) 70 (65–78) 72 (65–77)   0.834
Sex    0.004*  
 Male 37 (90.2%) 706 (70.2%)   0.14
 Female 4 (9.8%) 299 (29.8%)   0.14
Lesion location    < 0.001*  
 U 13 (31.7%) 157 (15.6%)   0.39
 M 24 (58.5%) 501 (34.5%)   0.50
 L 4 (9.8%) 347 (49.9%)   0.97
Morphology    0.62  
 Protruding 16 (39.1%) 322 (32.0%)   0.15
 Flat 0 (0%) 11 (1.1%)   0.15
 Depressed 25 (61.0%) 672 (66.9%)   0.12
Histology    0.27  
Differentiated 39 (95.1%) 981 (97.6%)   0.13
Undifferentiated 2 (4.9%) 24 (2.4%)   0.13
Lesion size (mm)    0.06  
 Mean ± SD 15.0 ± 7.16 19.8 ± 13.8   0.44
 Median (range) 14 (4–35) 16 (2–115)   
Specimen size (mm)    0.56  
 Mean ± SD 38.7 ± 8.18 42.4 ± 15.3   0.30
 Median (range) 40 (16–60) 40 (15–140)   
Depth    0.50  
 pT1a 37 (90.2%) 858 (85.4%)   0.15
 pT1b 4 (9.8%) 147 (14.6%)   0.15
Ulcer (scar)    0.76  
 Presence 2 (4.9%) 80 (8.0%)   0.12
 Absence 39 (95.1%) 921 (92.0%)   0.12
Suture line or anastomotic site    
 Involving 19 (%)  
 Not involving 22 (%)  
Skill level    < 0.001*  
 Expert 36 (87.8%) 623 (62.0%)   0.62
 Trainee 5 (12.2%) 382 (38.0%)   0.62
  1. ESD endoscopic submucosal dissection, SD standard deviation, ASD absolute standardized differences, U upper third of the stomach, M middle third of the stomach, L lower third of the stomach, pT1a tumor invasion within the mucosa, pT1b tumor invasion in the submucosa or deeper
  2. The p value was calculated using the χ2 test or Fisher exact test for categorical data
  3. The p value was calculated using the Mann-Whitney U test for continuous data not normally distributed
  4. *Significant