Table 3 Univariate Cox proportional-hazards regression (metric variables) with respect to PFS and OAS

SUVmax

1.00

0.94 - 1.06

0.94

0.97

0.91 - 1.05

0.48

SUVmean

0.99

0.88 - 1.10

0.80

0.91

0.78 - 1.06

0.21

MTV

1.00

1.00 - 1.01

0.49

1.01

1.00 - 1.01

0.07

TLG

1.00

1.00 - 1.00

0.89

1.00

1.00 - 1.00

0.21

ASP

1.01

1.00 - 1.03

0.009

1.02

1.00 - 1.03

0.03

Solidity

0.97

0.93 - 1.01

0.12

0.98

0.92 – 1.03

0.39

Gender: female

1.05

0.44 - 2.46

0.92

0.44

0.10 - 1.95

0.28

Histology: adenocarcinoma

0.90

0.21 - 3.90

0.89

1.04

0.13 - 8.17

0.97

Histology: SCC

0.44

0.09 - 2.07

0.30

0.70

0.08 - 5.98

0.74

Localization: central

0.68

0.31 - 1.47

0.33

2.23

0.81 - 6.10

0.12

T stage (TNM): T3/T4

0.71

0.31 - 1.61

0.41

1.24

0.45 - 3.42

0.68

UICC stage: III A-B

0.97

0.47 - 2.01

0.93

2.10

0.73 - 6.05

0.17

Surgery: no

1.90

0.91 - 3.97

0.09

3.56

1.29 - 9.83

0.01

Radiotherapy: no

0.66

0.31 - 1.41

0.28

0.40

0.13 - 1.26

0.12

Chemotherapy: no

0.66

0.23 - 1.91

0.45

0.59

0.13 - 2.60

0.49