Table 3 Relationship between the dosimetric variables of the SWOARs and the degree of late dysphagia.

From: Radiation-induced late dysphagia after intensity-modulated radiotherapy in nasopharyngeal carcinoma patients: a dose-volume effect analysis

SWOARs

Grade 0–1

Grade 2

 p value

PCM D mean

57.1 ± 3.1

60.3 ± 3.7

<0.001

SCM

D mean

65.8 ± 4.9

68.7 ± 3.8

0.001

V50

100(100,100)

100(100, 100)

0.281

V60

90.6(76.0,100)

99.4(91.9,100.0)

0.002

MCM

D mean

55.9 ± 4.3

58.8 ± 5.2

0.001

V50

81.7 (68.4,93.6)

95.6(84.7,100.0)

0.001

V60

28.2 (6.0, 46.2)

39.2 (19.6,65.8)

0.009

ICM

D mean

46.1 ± 3.4

49.5 ± 5.1

0.001

V50

16.0 (6.2,29.6)

31.9 (21.9,59.8)

<0.001

V60

0.9 (0.0,3.8)

1.6(0.0,5.1)

0.098

CPM

D mean

45.2 ± 4.2

45.2 ± 8.7

0.990

V50

8.6 (1.2,28.7)

12 (8.2,42.0)

0.108

V60

0 (0,0)

0 (0,0)

0.121

EIM

D mean

42.8 (40.1,45.7)

44.4 (40.5,46.9)

0.223

V50

0 (0.0,6.8)

0.6 (0.0,13.5)

0.210

V60

0 (0,0)

0 (0,0)

0.755

  1. D, dose; V50,60, partial volume receiving specified dose of 50 Gy; 60 Gy; SCM, superior constrictor muscle; MCM, middle constrictor muscle; ICM, inferior constrictor muscle; CPM, cricopharyngeus muscle; EIM, esophageal inlet muscle.