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

Table 4 Tumor factors involving long procedure times for ESD-P

	Long procedure time	Shorter procedure time	P
	n = 30	n = 11	P
Previous surgery type, (%)			0.412
Distal gastrectomy	20 (66.7%)	7 (63.6%)
Proximal gastrectomy	3 (10.0%)	2 (18.2%)
Pylorus preserving gastrectomy	0 (0%)	1 (9.1%)
Esophagectomy	7 (23.3%)	1 (9.1%)
Tumor size, n (%)			0.651
< 21	24 (80%)	10 (90.9%)
≥ 21	6 (20%)	1 (9.1%)
Tumor depth, n (%)			0.559
T1a	26 (86.7%)	11 (100%)
T1b	4 (13.3%)	0 (0%)
Lesion location, n (%)			0.719
Upper	9 (30.0%)	4 (36.4%)
Middle or lower	21 (70.0%)	7 (63.6%)
Suture line or anastomotic site, n (%)			0.038*
Involved	17 (56.7%)	2 (18.2%)
Not involved	13 (43.4%)	9 (81.8%)
Morphology, n (%)			0.287
Flat or depressed	20 (66.7%)	5 (45.5%)
Protruding	10 (33.3%)	6 (54.5%)
Histology, n (%)			1
Differentiated	28 (93.3%)	11 (100%)
Undifferentiated	2 (6.7%)	0 (0%)
Ulceration (scar)			1
Presence	2 (6.7%)	0 (0%)
Absence	28 (93.3%)	11 (100%)

ESD-P endoscopic submucosal dissection for early gastric cancer in the postoperative stomach
The p value was calculated using the χ² test or the Fisher exact test for categorical data
*Significant

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