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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%