|
Variables
|
Number of patients
|
Percent (%)
|
|---|
|
Sex
|
|
Male
|
160
|
72.4
|
|
Female
|
61
|
27.6
|
|
Age (years)
|
|
≥ 65
|
100
|
45.2
|
|
< 65
|
121
|
54.8
|
|
Grade
|
|
Well or moderately differentiated
|
51
|
23.1
|
|
Poorly differentiated
|
170
|
76.9
|
|
Location
|
|
Lower
|
180
|
81.4
|
|
Middle
|
13
|
5.9
|
|
Upper
|
28
|
12.7
|
|
T stage
|
|
T1
|
23
|
10.4
|
|
T2
|
39
|
17.6
|
|
T3
|
98
|
44.3
|
|
T4
|
61
|
27.6
|
|
N stage
|
|
N0
|
67
|
30.3
|
|
N1
|
46
|
20.8
|
|
N2
|
34
|
15.4
|
|
N3
|
74
|
33.5
|
|
TNM stage
|
|
I
|
43
|
19.5
|
|
II
|
63
|
28.5
|
|
III
|
115
|
52.0
|
|
LN
|
|
< 15
|
43
|
19.5
|
|
≥ 15
|
178
|
80.5
|
|
LNR
|
|
0
|
68
|
30.8
|
|
0–0.13
|
47
|
21.3
|
|
0.13–0.4
|
54
|
24.4
|
|
> 0.4
|
52
|
23.5
|
- The depth of primary tumor invasion (T stage), classification of regional metastasis lymph nodes (N stage), and TNM stage were based on the 7th edition TNM staging system; LN: number of lymph nodes examined; LNR: ratio between the positive lymph nodes and the total number of lymph nodes examined
