Table 1 Patient Characteristics

Age(year)

63.6 ± 12.4

60.6 ± 11.7

61.0 ± 12.3

65.0 ± 8.1

Gender(male:female)

42:15

33:5

22:10

11:3

Drinker(No vs Yes)

47:10

26:12

23:9

13:1

Smoker(No vs Yes)

39:18

24:14

20:12

11:3

Clinical T stage

 I: II: III

23:28:6

4:26:8

11:19:2

2:8:4

Grade of tumor

 Low: Moderate: Poor

6:51:0

0:32:6

5:26:1

0:13:1

 Pathological Tumor size(cm)

2.5(1.0–6.0)

3.8(1.0–6.0)

3.0(1.0–5.0)

3.3(2.0–7.0)

Depth of invasion

 ≦5 mm: > 5 mm,≦10 mm: > 10 mm

20:16:21

3:2:33

12:6:14

0:5:9

Pathological T stage

 I: II: III

14:22:21

1:4:33

10:11:11

0:4:10

 Margin(negative vs positive)

56:1

32:2

32:0

13:1

 Perineural invasion(No vs Yes)

46:11

19:15

28:4

8:6

 Lymphovascular invasion(No vs Yes)

57:0

36:2

32:0

14:0

 Tumor SUVmax

12.3(3.0–32.4)

13.7(3.7–31.7)

8.9(2.1–49.7)

8.8(1.4–27.6)

 Tumor SUVmean

5.9(1.8–16.8)

7.6(2.9–19.3)

5.4(1.4–32.6)

4.8(0.8–17.5)

 Heterogeneity index^a

1.7(1.1–2.6)

1.7(1.3–2.0)

1.6(1.5–1.8)

1.7(1.6–1.9)

 Tumor MTV(cm³)

4.3(0.8–50.7)

9.0(2.0–70.3)

4.6(1.1–26.6)

6.3(2.1–93.4)

 Tumor TLG

28.7(3.3–411.6)

75.2(10.3–1052.7)

25.6(3.3–156.1)

37.3(8.3–463.0)

 Nodal long diameter(cm)

0.9(0.4–1.3)

1.0(0.5–1.2)

0.9(0.6–1.2)

1.0(0.7–1.2)

 Nodal short diameter(cm)

0.6(0.3–1.1)

0.7(0.4–1.1)

0.7(0.3–1.1)

0.8(0.4–0.9)

 Nodal SUVmax

2.2(0.5–5.2)

3.7(1.1–10.6)

1.9(0.9–4.5)

2.66(1.1–15.7)