Table 1.

Correlation analysis of numerical variables and endoscopic submucosal dissection time

Predictive factors	Data	ESD time (min) median (IQR)	Analysis method	P value
Age	mean ± SD	41.00 (39.00)	Pearson correlation	0.3135
	62.00 ± 11.69
Tumor size (cm2)	Median (IQR)	41.00 (39.00)	Pearson correlation	< 0.0001
	7.00 (8.82)
Proficiency level	n	ESD time per unit area(min)	Pearson correlation	< 0.0001
	1-183	5.00 ± 3.87

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