Table 2.

Comparison of the upper third and non-upper third groups n (%)

	Upper third	Non-upper third	P value
Tumor size, mm
< 20	70 (71.4)	964 (71.7)	0.520
≥ 20	28 (28.6)	381 (28.3)
Ulcer	2 (2.0)	69 (5.1)	0.172
Pathology
Dysplasia	45 (45.9)	665 (49.4)	0.501
Carcinoma	53 (54.1)	680 (50.6)
Curability
Incomplete resection	19 (19.4)	137 (10.2)	0.005
Complete resection	79 (80.6)	1208 (89.8)
Resectability
En bloc	83 (84.7)	1235 (91.8)	0.015
Piecemeal	15 (15.3)	110 (8.2)
Procedure time, min, mean ± SD	90.51 ± 58.06	59.71 ± 45.46	< 0.001
Perforation	9 (9.2)	30 (2.2)	< 0.001
Post-ESD bleeding	4 (4.1)	57 (4.2)	0.600

ESD: Endoscopic submucosal dissection.