Table 2.

Categorical variables and endoscopic submucosal dissection time

Predictive factors	n (%)	ESD time (min) median (IQR)	Analysis method	P value
Location			Kruskal wallis	< 0.0001
Upper	44 (24.0)	52.00 (69.00)
Middle	52 (28.4)	48.00 (33.00)
Lower	87 (48.6)	26.00 (33.50)
Macroscopic appearance			Kruskal wallis	< 0.0001
Protrusion	76 (41.5)	23.00 (31.00)
Indentation	61 (33.3)	49.00 (31.00)
Mixed	46 (25.2)	50.00 (43.50)
Pathological type			Kruskal wallis	0.2410
Adenoma	36 (19.7)	25.00 (27.00)
HIN	97 (53.0)	29.00 (36.00)
Invasive carcinoma	50 (27.3)	51.00 (29.50)
Adhesion			Mann-whitney	0.0010
Yes	14 (7.7)	81.50 (149.00)
No	179 (92.3)	39.00 (35.00)
Gender			Mann-whitney	0.0210
Male	134 (73.2)	47.00 (41.00)
Female	49 (26.8)	29.00 (25.50)

ESD: Endoscopic submucosal dissection; IQR: Interquartile-range.