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Table 3 Swallowing structure DVH parameters (median value and range) and p values for association with GT dependence

From: Clinical-dosimetric analysis of measures of dysphagia including gastrostomy-tube dependence among head and neck cancer patients treated definitively by intensity-modulated radiotherapy with concurrent chemotherapy

 

V40

(%)

V50

(%)

V60

(%)

V65

(%)

Dmax

(Gy)

Dmean

(Gy)

CE

      

   GT > 192 d

57 (1-86)

24 (0-79)

0 (0-33)

0 (0-1)

61 (45-77)

36 (20-53)

   GT ≤ 192 d

65 (17-98)

27 (0-86)

0 (0-13)

0 (0-0)

57 (44-76)

36 (21-56)

 

p = 2.671

p = 0.524

p = 0.173

P = 0.169

p = 0.238

p = 0.383

CPI

      

   GT > 192 d

100 (60-100)

100 (4-100)

8 (0-100)

0 (0-100)

64 (56-78)

57 (42-69)

   GT ≤ 192 d

100 (93-100)

95 (3-100)

0 (0-73)

0 (0-27)

58 (53-67)

53 (43-62)

 

p = 0.512

p = 0.069

p = 0.050

P = 0.062

p = 0.011

p = 0.083

IPC

      

   GT > 192 d

100 (97-100)

100 (76-100)

81 (40-100)

42 (21-100)

74 (66-79)

64 (54-70)

   GT ≤ 192 d

100 (95-100)

92 (40-100)

37 (10-84)

15 (0-60)

72 (68-77)

55 (46-68)

 

p = 0.367

p = 0.042

p = 0.002

P = 0.003

p = 0.057

p = 0.016

SMPC

      

   GT > 192 d

100 (60-100)

100 (56-100)

94 (45-100)

72 (21-93)

76 (66-79)

67 (38-72)

   GT ≤ 192 d

100 (84-100)

97 (70-100)

90 (25-100)

60 (0-95)

76 (70-79)

65 (50-71)

 

p = 0.378

p = 0.072

p = 0.063

P = 0.091

p = 0.252

p = 0.086

  1. Abbreviation: DVH = Dose-volume histogram; GT = gastrostomy tube; SMPC = superior and middle pharyngeal constrictor; IPC = inferior pharyngeal constrictors; CPI = cricoid pharyngeal inlet; and CE = cervical esophagus; Dmax = maximum dose; Dmean = mean dose.