Whole-body magnetic resonance imaging (WB-MRI) reporting with the METastasis Reporting and Data System for Prostate Cancer (MET-RADS-P): inter-observer agreement between readers of different expertise levels

Table 4 Inter-observer Agreement for Primary/Dominant and Secondary RAC

	Primary RAC Weighted Kappa	Secondary RAC Weighted Kappa
Bone
Skull	N.E.^a	N.E.^a
Cervical Spine	0.86 (0.67–1.00)	0.93 (0.80–1.00)
Dorsal Spine	0.93 (0.86–1.00)	0.79 (0.62–0.96)
Lumbosacral Spine	0.81 (0.69–0.94)	0.44 (0.13–0.74)
Pelvis	0.90 (0.82–0.98)	0.68 (0.47–0.89)
Thorax	0.78 (0.64–0.92)	0.65 (0.39–0.91)
Limbs	0.81 (0.62–0.99)	0.72 (0.38–1.00)
SOFT TISSUES
Primary Site	0.21 (0.00–0.50)	N.E.^a
Pelvic Nodes	0.56 (0.14–0.99)	0.66 (0.26–1.00)
Retroperitoneal Nodes	0.64 (0.40–0.89)	0.89 (0.70–1.00)
Other Nodes	0.77 (0.54–1.00)	N.E.^a
Liver	0.68 (0.28–1.00)	N.E.^a
Lungs	0.91 (0.73–1.00)	N.E.^a
Other Sites	1.00 (1.00–1.00)	N.E.^a

^a N.E. non evaluable
Agreement was classified by kappa as Excellent (0.81–1.00), Substantial (0.61–0.80), Moderate (0.41–0.60), Fair (0.21–0.40), or None-slight (0.00–0.20)

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