Table 3 Univariate analysis of 235 patients with squamous cell carcinoma of the middle thoracic esophagus

Age (years)

0.771

< 60

132

78 52 40

37

≥ 60

103

81 51 37

42

Sex

0.206

Male

194

79 50 38

36

Female

41

71 59 43

60

Differentiation

0.080

G1

49

88 55 49

45

G2

143

81 53 40

42

G3

43

65 40 36

24

T category

<0.001*

T1/T2

70

91 71 62

86

T3/T4

165

74 42 29

29

Node status

<0.001*

N0

102

92 71 60

83

N1

57

77 46 24

32

N2

49

78 39 26

24

N3

27

37 11 7

11

Node status

<0.001*

N0

102

92 71 60

83

N + RLN-

52

71 35 19

24

N + RLN+

81

68 37 22

24

Node status

<0.001*

N0

102

92 71 60

83

≤ 6 positive nodes (N+)

106

77 43 25

30

≥ 7 positive nodes (N+)

27

37 11 7

11

Lymphatic and venous invasion

<0.001*

No

190

82 56 42

44

Yes

45

67 31 23

22

Intramural metastasis

0.009*

No

220

81 53 40

42

Yes

15

60 20 20

18

Adjuvant therapy

0.034*

No

179

79 53 44

46

Yes

56

79 45 19

25

Lymphadenectomy type

0.271

2-field

159

80 54 41

45

3-field

76

78 45 35

33