Table 3.

Degree of Submucosal Involvement for Tumors with Submucosal Invasion*

Degree of submucosal involvement†	LN metastasis (–) (n=21)	LN metastasis (+) (n=16)	p-value‡
sm1	1 (4.8)	2 (12.5)	0.456
sm2	8 (38.1)	3 (18.8)
sm3	12 (57.1)	11 (68.8)

Data are presented as number (%).

LN, lymph node.

*One patient was excluded from the analysis owing to the lack of information on the degree of submucosal involvement; ^†For lesions confined to the submucosa, degree of submucosal involvement was classified as sm1 (upper third), sm2 (middle third) or sm3 (lower third); ^‡p-value is calculated by Fisher exact test.