Table 2.

Comparison of lymph node metastasis rate, metastasis degree in each group

Lymph node groups	Number of positive cases (cases)	Number of cleaning cases (cases)	Lymph node metastasis rate (%)	Number of positive lymph nodes(pcs)	Number of lymph nodes cleared(pcs)	Lymph node metastasis degree(%)
Upper middle mediastinum	0	33	0.0	0	141	0.0
inferior mediastinum	5	93	5.4	10	207	4.8
Perigastric + Suprapancreatic	69	112	61.6	401	1485	27.0
Perigastric + hepatoduodenal	13	76	17.1	32	457	7.0
P-value	-	-	< 0.001	-	-	< 0.001

Lymph node metastasis rate: mid-upper mediastinal cluster vs. lower mediastinal cluster, P = 0.325; mid-upper mediastinal cluster vs. perigastric + supra pancreatic cluster, P < 0.001; mid-upper mediastinal cluster vs. lower perigastric + hepatoduodenal cluster, P = 0.009; lower mediastinal cluster vs. perigastric + supra pancreatic cluster, P < 0.001; lower mediastinal cluster vs. lower perigastric + hepatoduodenal cluster, P = 0.014; upper perigastric + supra pancreatic cluster vs. inferior perigastric + hepatoduodenal cluster, P < 0.001

Degree of lymph node metastasis: mid-upper mediastinal cluster vs. lower mediastinal cluster, P = 0.007; mid-upper mediastinal cluster vs. upper perigastric + supra pancreatic cluster, P < 0.001; mid-upper mediastinal cluster vs. lower perigastric + hepatoduodenal cluster, P = 0.001; lower mediastinal cluster vs. upper perigastric + supra pancreatic cluster, P < 0.001; lower mediastinal cluster vs. lower perigastric + hepatoduodenal cluster P = 0.287; upper perigastric + supra pancreatic cluster vs. inferior perigastric + hepatoduodenal cluster, P < 0.001