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Table 1 Inter-observer agreement of the morphological findings for the 111 primary tumor sites

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 1 Reader 2 Matched cases between reader 1 &2 K 95% CI P value Percent agreement
Discrete nodular enhancement. 53 56 47 0.730 0.603–0.857 < 0.001* 86.5%
Definite progressive mass. 25 13 12 0.564 0.369–0.760 < 0.001* 87.39%
New or enlarging discrete nodule/ mass 34 40 19 0.273 0.087–0.458 0.004* 67.57%
Deep ill-defined enhancement. 63 24 21 0.247 0.116–0.378 0.001* 59.46%
Deep, ill-defined soft tissue mass. 59 19 14 0.135 0.004–0.266 0.049* 54.95%
Focal mucosal non-mass like enhancement. 16 6 4 0.309 0.05–0.568 < 0.001* 87.39%
No enhancement. 14 12 11 0.826 0.658–0.993 < 0.001* 96.4%
Diffuse linear mucosal enhancement. 31 30 24 0.706 0.56–0.856 < 0.001* 88.3%
Non-mass like tissue distortion. 67 49 41 0.402 0.242–0.562 < 0.001* 69.37%
Low density mucoid mucosal edema. 22 22 14 0.546 0.350–0.743 < 0.001* 85.6%