Table 2. Frequency of metastasis to supraclavicular, Left gastric, Celiac or Common hepatic node in terms of the location of primary tumor.

Positive rate	Upper ESCC	Middle ESCC	Lower ESCC	X2	P value
Supraclavicular	70 (70/100)	52.8 (57/108)	55.3 (47/85)	7.216	0.027*
Left gastric	16 (16/100)	35.2 (38/108)	38.8 (33/85)	13.936	0.001***
Celiac	21 (21/100)	17.6 (19/108)	27.1 (23/85)	2.548	0.28
Common hepatic	6 (6/100)	12 (13/108)	15.3 (13/85)	4.298	0.117

*, P < 0.05; **, P < 0.01; ***, P < 0.001.