Table 2 Univariate analysis

Age (years)

  v < 60

6.2

0.08

9.5

0.929

  ≥ 60

5.8

9.1

Sex

 Female

5.3

0.584

9

0.949

 Male

6.2

9.4

Degree of differentiation

 Well

6.8

0.08

10

0.119

 Moderate

6.4

9.2

 poor

5.5

8.9

Primary site

 Upper thorax

7.3

0.001

9.2

0.038

 Middle thorax

6.7

10.3

 Lower thorax

3.8

8.9

Chemotherapy cycles

 1

6.1

0.145

8

0.038

 2

5.6

8.2

 3

6.4

9.2

  ≥ 4

6.7

10.5

Metastasis

 Local

6.9

0.0587

9.5

0.714

 Distant

5.9

9.2