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Table 2 Matching factors between ESD-P and ESD-N after 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 = 41
Variable-matching between groups
 Age (y), mean ± SD 70.4 ± 9.16 72.9 ± 7.99 0.29 0.33
 Age (y), median (IQR) 70 (65–78) 73 (67–80)   
 Sex, male/female 37/4 38/3 1 0.15
 Tumor size (mm), mean ± SD 15.0 ± 7.16 15.4 ± 9.36 0.73 0.048
 Tumor depth, T1a/T1b 37/4 36/5 1 0.078
 Lesion location, U/M and L 13/28 13/28 1 0
 Histology, differentiated/undifferentiated 39/2 39/2 1 0
 Presence of ulceration 2 2 1 0
 Operator skill, expert/trainee 36/5 36/5 1 0
  1. ESD-P, endoscopic submucosal dissection of the postoperative stomach, ESD-N endoscopic submucosal dissection of the non-operative stomach, SD standard deviation, ASD absolute standardized differences, pT1a tumor invasion within the mucosa, pT1b tumor invasion in the submucosa or deeper, U upper third of the stomach, M middle third of the stomach, L lower third of the stomach
  2. The p value was calculated using the χ2 test or Fisher exact test for the categorical data
  3. The p value was calculated using the Mann-Whitney U test for continuous data not normally distributed