Table 9.

Relation between tumor location and the sites of lateral lymph node metastasis

Tumor location	The site of lateral lymph node metastasis				χ 2	P value
	Level II	Level III	Level IV	Level V
					9.621	0.649
Upper 1/3 of the lobe (n = 57 cases)	34	38	36	15
Middle 1/3 of the lobe (n = 20 cases)	5	10	18	5
Lower 1/3 of the lobe (n = 29 cases)	8	16	19	5
Isthmus (n = 13 cases)	3	8	10	2
Whole (n = 11 cases)	4	7	10	2