Table 2:

Interobserver reliability

	κ Coefficient	Agreement
Psoas abscess	0.87	Almost Perfect
Psoas enhancement	0.81	Almost Perfect
Psoas T2a	0.78	Substantial
Vertebral body T2 hyperintensity	0.76	Substantial
Vertebral body T1 hypointensity	0.75	Substantial
Vertebral body enhancement	0.75	Substantial
Disc T2 hyperintensity	0.73	Substantial
Endplate destruction	0.67	Substantial
Epidural phlegmon	0.59	Moderate
Epidural abscess	0.58	Moderate
Disc enhancement	0.50	Moderate
Disc increased height	0.44	Moderate

^aImaging psoas sign..