Table 2.

ASPECTS agreement between different raters

			Cohen κ (95% CI)
Agreement between consensus of 2 neuroradiologists and a neuroimaging fellow for total ASPECTS assessed with Cohen’s κ	Total ASPECTS	Setting 1	0.486 (0.235–0.736)
		Setting 2	0.583 (0.353–0.814)
		Setting 3	0.678 (0.458–0.898)
Agreement between consensus of 2 neuroradiologists and a senior radiology resident for total ASPECTS assessed with Cohen’s κ	Total ASPECTS	Setting 1	0.198 (−0.111–0.507)
		Setting 2	0.491 (0.246–0.737)
		Setting 3	0.443 (0.201–0.684)
Correlation among the three ratings (consensus, neuroradiology fellow and senior radiology resident) for total ASPECTS assessed with ICC	Total ASPECTS		ICC (95% CI)	Interpretation
		Setting 1	0.741 (0.571–0.851)	Good
		Setting 2	0.936 (0.893–0.963)	Very good
		Setting 3	0.780 (0.785–0.925)	Good

Setting 1, 80 HU window width and 20 HU center level; Setting 2, 8 HU window width and 32 HU center level;

Setting 3, 20 HU window width with 35 HU center level.

ASPECTS, Alberta stroke program early computed tomography score; CI, confidence interval; ICC, intraclass correlation coefficient.