Table 2:

Qualitative assessment of ischemia/infarct (κ statistics)

	Observer 1	Observer 2	Observer 3	Observer 4	Observer 5
Observer 2	0.76
Observer 3	0.67	0.69
Observer 4	0.86	0.64	0.55
Observer 5	0.87	0.64	0.57	0.74
Observer 6	1.0	0.87	0.66	0.86	0.86

Note:—Observer 1, radiology resident physician; observer 2, neuroradiology attending physician; observer 3, neurology attending physician; observer 4, neuroradiology fellow; observer 5, junior CT technologist; observer 6, senior CT technologist.