Table 2.

Summary of the medical information for esophageal cancer patients.

Covariates	Category	Total
Age, years, no (%)	<60	82
	≥60	87
Gender, no (%)	Male	23
	Female	146
Vital status	Alive	104
	Dead	65
Disease stage, no (%)	Stage I	20
	Stage II	68
	Stage III	55
	Stage IV	6
Lymph node involvement, no (%)	N0	20
	N1	63
	N2	12
	N3	7
	NX	2
M stage, no (%)	M0	126
	M1	2
	M1a	4
	MX	17
T stage, no (%)	T0	1
	T1	30
	T2	35
	T3	83
	T4	5
R stage, no (%)	R0	126
	R1	12
	R2	1
	RX	7