Optimal extent of lymphadenectomy improves prognosis and guides adjuvant chemotherapy in esophageal cancer: A propensity score-matched analysis

Table 1 Clinicopathological information of the study population

Variables	Level	Overall
Number		1042
Sex, n (%)	Male	820 (78.7)
	Female	222 (21.3)
Age (yr), median (IQR)		60 (54, 66)
T, n (%)	1	98 (9.4)
	2	219 (21.0)
	3	487 (46.7)
	4	238 (22.8)
N, n (%)	0	612 (58.7)
	1	234 (22.5)
	2	134 (12.9)
	3	62 (6.0)
G, n (%)	Well differentiated	124 (11.9)
	Moderate differentiated	740 (71.0)
	Poor differentiated	178 (17.1)
Venous thrombus, n (%)	Negative	887 (85.1)
	Positive	155 (14.9)
Perineurial invasion, n (%)	Negative	509 (75.0)
	Positive	170 (25.0)
NPLN, mean (SD)		1.17 (2.15)
RPLN, mean (SD)		0.06 (0.11)
NRLN, mean (SD)		19.67 (9.81)
Adjuvant chemotherapy, n (%)	No	599 (57.5)
	Yes	443 (42.5)

IQR: Interquartile range; NPLN: Number of positive lymph nodes; RPLN: Ratio of positive lymph nodes.