Table 3 Univariate analysis

All

124

58.5

61.1

68.4

Mean age, year

 ≤ 60

60.7 ± 12.0^a

59.3

0.766^b

61.9

0.940^b

63.8

0.286^b

 > 60

53.3

58.2

79.1

Sex

Female

17 (13.7)

61.8

0.830^b

61.8

0.921^b

67.7

0.926^b

Male

107 (86.3)

57.5

61.4

70.6

Subsite

Base of tongue

94 (75.8)

57.6

0.807^b

63.4

0.829^b

68.7

0.756^b

Soft palate

22 (17.7)

36.4

40.4

80.8

Tonsil

6 (4.8)

66.7

66.7

66.7

Pharyngeal walls

2 (1.6)

100

100

100

T stage

T1

15 (12.1)

73.3

0.421^b

86.7

0.024^b

86.7

0.018^b

T2

36 (29.0)

55.2

62.4

72.8

T3

46 (37.1)

52.8

50.1

55.7

T4

27 (21.8)

63.3

76.7

85.2

N stage

N0

76 (61.3)

61.9

0.003^b

62.8

0.712^b

70.8

0.749^b

N1

28 (22.3)

55.9

49.0

54.8

N2

16 (12.9)

60.0

71.4

71.4

N3

4 (3.2)

25.0

50.0

50.0

SND

I-III

62 (50.0)

55.0

0.914^b

58.9

0.778^b

74.0

0.290^b

I-IV

62 (50.0)

60.1

61.5

64.8

DOI, mm

 ≤ 5

21 (16.9)

63.0

0.546^b

62.1

0.864^b

62.1

0.666^b

5 < DOI ≤ 10

30 (24.2)

40.6

51.7

64.6

 > 10

73 (58.9)

62.3

65.8

72.1

Histologic grade

Well

62 (50.0)

56.8

0.871^b

62.0

0.531^b

69.2

0.768^b

Moderate

54 (43.5)

50.0

68.2

70.2

Poor

8 (6.5)

75.0

75.0

75.0

LVI

Yes

14 (11.3)

50.0

0.786^b

65.0

0.600^b

75.0

0.673^b

No

110 (88.7)

59.5

45.2

68.0

PNI

Yes

20 (16.1)

70.0

0.646^b

80.0

0.524^b

80.0

0.783^b

No

104 (83.9)

56.2

59.0

69.5

Radiotherapy

Yes

61 (49.2)

63.9

0.421^b

70.8

0.235^b

75.5

0.415^b

No

63 (50.8)

53.8

57.6

66.4

Chemoradiotherapy

Yes

20 (16.1)

44.0

0.071^b

26.8

0.019^b

26.8

0.005^b

No

104 (83.8)

61.4

70.8

79.9