Table 2 Predictors for disease-free survival in oesophageal squamous cell carcinoma by univariate analysis

Gender

0.029

 Male

29.2

23.1–35.3

 Female

42.9

22.4–63.3

Age

0.608

 <65 years

34.2

26.6–41.9

 ≥65 years

27.2

20.5–33.9

Smoking status

0.064

 Non-smoker

43.7

20.9–66.4

 Smoker

28.7

22.6–34.8

Tumour location

0.379

 Upper

27.1

20.7–33.5

 Middle

39.2

31.1–47.2

 Lower

27.2

20.9–33.5

Tumour length

0.003

 ≤4.0 cm

42.9

34.4–51.3

 >4.0 cm

27.4

23.0–31.8

Surgical approach

0.734

 Right incision

27.2

19.3–35.0

 Left incision

35.3

27.7–42.8

Differentiation

0.763

 G1

30.0

19.7–40.3

 G2

32.8

22.0–43.6

 G3

35.5

21.0–49.8

p T stage

<0.001

 T1+T2

56.3

28.3–84.3

 T3+T4

27.1

22.6–31.5

p N stage

<0.001

 N0

68.5

45.4–91.6

 N1+N2+N3

19.7

13.9–25.5

Adjuvant therapy

0.570

 With

38.8

29.4–48.2

 Without

27.8

22.4–33.1

p TNM stage

<0.001

 I stage

71.4

43.9–98.8

 II stage

56.7

31.1–82.3

 III stage

21.6

15.7–27.5

 IV stage

10.8

4.9–16.6

Vascular invasion

0.001

 Presence

21.0

15.5–26.5

 No

41.8

32.1–51.6

Lymphatic invasion

<0.001

 Presence

18.6

11.1–26.1

 No

41.0

31.8–50.2