Table 5 Results from Cox regression analysis of overall progression free survival

VATS vs. thoracotomy

1.01

0.01

0.28

0.03

0.98

CCI score

0.97

-0.03

0.07

-0.40

0.69

grade 2 vs. grade 1

2.76

1.02

1.03

0.97

0.33

grade 3 vs. grade 1

4.13

1.42

1.03

1.37

0.17

grade unknown vs. grade 1

2.44

0.89

1.16

0.76

0.45

L1 vs. L0

4.24

1.44

0.41

2.99

0.003

V1 vs. V0

0.62

-0.63

0.45

-1.29

0.20