Table 2 Baseline characteristics

Age (mean ± sd)

56.55 ± 5.48

Gender, n (%)

Male

45 (75)

Female

15 (25)

Smoking, n (%)

Never

10 (16.6)

Previous

16 (26.7)

Actual

34 (56.7)

Alcohol, n (%)

Never

39 (65)

≤20 g/d

13 (21.7)

21 to 40 g/d

4 (6.7)

41 to 60 g/d

2 (3.3)

61 to 80 g/d

0 (0)

Unknown

2 (3.3)

Betel nut chewing, n (%)

Yes

52 (86.7)

No

8 (13.3)

Tumor size, n (%)

T2

6 (10)

T3

10 (16.7)

T4

44 (73.3)