Table 2 Associations of adjuvant radiotherapy with clinicopathological characteristics after excluding patients with adverse risk factors—second group

Characteristics

n = 20

n = 20

Age (years)^a

55.7 ± 11.2 (79.7, 41.0)

56.4 ± 10.2 (72.3, 36.6)

0.56

 Male

17

19

0.29

 Female

3

1

 Buccal mucosa

10

8

0.47

 Mouth floor

3

1

 Gum

2

2

 Lip

0

2

 Tongue

5

7

 1

2

3

0.24

 2

15

9

 3

2

4

 4

1

4

 III

19

16

0.15

 IV

1

4

 1

1

0

0.43

 2

7

10

 3

12

10

 (−)

19

16

0.15

 (+)

1

4

 (−)

20

19

0.31

 (+)

0

1