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Table 4 Intra-observer agreement for the morphological findings for the 111 primary lesions

From: Interreader reproducibility of the Neck Imaging Reporting and Data system (NI-RADS) lexicon for the detection of residual/recurrent disease in treated head and neck squamous cell carcinoma (HNSCC)

Morphological and enhancement pattern

Reader

First reading

Second reading

Matched cases between 1st & 2nd reading

K

95% CI

P value

Percent agreement

Discrete nodular enhancement.

1

53

53

48

0.819

0.713–0.925

< 0.001*

95.4%

2

56

62

55

0.856

0.760–0.952

< 0.001*

92.7%

Definite progressive mass.

1

25

26

22

0.822

0.694–0.949

< 0.001*

93.7%

2

13

15

12

0.837

0.682–0.992

< 0.001*

92.8%

New or enlarging discrete nodule mass

1

34

39

31

0.776

0.650–0.911

< 0.001*

90.1%

2

40

42

35

0.768

0.644–0.891

< 0.001*

89.2%

Deep ill-defined enhancement.

1

63

56

54

0.802

0.795–0.983

< 0.001*

90%

2

24

27

22

0.822

0.695–0.949

< 0.001*

93.7%

Deep, ill-defined soft tissue mass.

1

59

59

54

0.819

0.711–0.927

< 0.001*

90.9%

2

19

23

18

0.824

0.688–0.959

< 0.001*

94.6%

Focal mucosal non-mass like enhancement.

1

16

19

15

0.831

0.687–0.974

< 0.001*

87.39%

2

6

9

6

0.786

0.552–1.0

< 0.001*

97.3%

No enhancement.

1

14

14

14

1

1–1

< 0.001*

100%

2

12

11

11

0.952

0.857–1.0

< 0.001*

99.1%

Diffuse linear mucosal enhancement.

1

31

32

29

0.889

0.794–0.983

< 0.001*

95.5%

2

30

31

28

0.887

0.790–0.983

< 0.001*

95.5%

Non-mass like tissue distortion.

1

67

66

64

0.906

0.825–0.986

< 0.001*

95.5%

2

49

49

45

0.854

0.756–0.952

< 0.001*

92.8%

Low density mucoid mucosal edema.

1

22

20

19

0.883

0.994–0.771

< 0.001*

96.4%

2

22

22

19

0.830

0.698–0.961

< 0.001*

94.6%