Table 3.

Intraprotocol interreader, interprotocol interreader, and interprotocol intrareader agreement using kappa statistics

Item	Intraprotocol (standard vs. standard) interreader agreement	Interprotocol (standard vs. simplified) interreader agreement	Interprotocol intrareader agreement
Focal bone marrow abnormalities 95%CI	0.413 0.337–0.536	0.405 0.339–0.472	0.760 0.678–0.843
Juxtadiscal Modic changes 95%CI	0.393 0.332–0.454	0.389 0.348–0.431	0.781 0.735–0.826
Degenerative changes at the margins of the vertebral bodies 95%CI	0.389 0.361–0.416	0.357 0.333–0.381	0.792 0.770–0.814
Schmorl’s nodes 95%CI	0.253 0.197–0.309	0.236 0.192–0.280	0.874 0.839–0.909
Endplate fractures 95%CI	0.671 0.535–0.807	0.723 0.632–0.815	0.914 0.838–0.989
Foraminal stenosis 95%CI	0.578 0.523–0.634	0.570 0.531–0.609	0.843 0.807–0.879
Facet arthropathy 95%CI	0.362 0.316–0.407	0.359 0.323–0.396	0.716 0.676–0.755
Spondylolysis 95%CI	0.542 0.290–0.794	0.470 0.274–0.667	0.629 0.374–0.884

Note: All items were graded using unweighted Cohen’s kappa statistics except for foraminal stenosis (linear weight)