Table 1 Patient and tumour characteristics [22]

Gender

 Female

 Male

Age at diagnosis (in years)

 Mean

 Standard deviation

 Median

 Range

 <40 years

 40–49 years

 50–59 years

 60–69 years

 70–79 years

 80+ years

Stage

 1

 2

 3

 4

T category

 1

 2

 3

 4

N category

 0

 1

 2

Smoking history

 No/never

 Yes

 Unknown

Alcohol >20 g/day

 No/never/social

 Past or current

 Unknown

ECOG performance status

 0

 1

 2

 3

 Unknown