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)

Table 2 Inter-observer agreement of the CT & MRI & cross section examination per lesion (P lesion) and per patient (P patient) for the primary tumor site

Groups	K	95% CI	P value	Percent agreement
P lesion: CT (No = 51)	0.862	0.748–0.977	< 0.001*	90.2%
P lesion: MRI (No = 60)	0.778	0.645–0.912	< 0.001*	85.0%
P lesion: Cross section (No = 111)	0.819	0.731–0.908	< 0.001*	87.39%
P lesion for oral cavity: Cross section (No = 39)	0.80	0.647–0.953	< 0.001*	82.1%
P lesion for larynx: Cross section (No = 38)	0.92	0.817–1.0	< 0.001*	94.7%
P patient: CT (No = 45)	0.843	0.713–0.973	< 0.001*	88.9%
P patient: MRI (No = 52)	0.77	0.627–0.917	< 0.001*	84.62%
P patient: Cross section (No = 97)	0.808	0.710–0.904	< 0.001*	86.6%

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