Table 2.

Cohen’s kappa comparing interreader lesion detection agreement between pairs of readers, intrareader agreement between repeated reads of the same subject, and interscan agreement between the standard and low-count-enhanced scans, stratified by the type of scans and readers.

Interreader agreement (N = 120)	Reader pairs
	1 and 2	1 and 3	2 and 3
Low-Count-Enhanced	0.55 (0.42–0.67)	0.66 (0.55–0.77)	0.72 (0.61-0.83)
Standard	0.65 (0.53–0.76)	0.71 (0.61–0.81)	0.75 (0.65-0.85)
Overall	0.60 (0.51–0.68)	0.69 (0.61–0.76)	0.73 (0.66-0.81)
Intrareader Agreement (N = 20)	Reader number
	1	2	3
Low-Count-Enhanced	0.74 (0.5–0.98)	0.74 (0.46–1.0)	0.95 (0.85-1.0)
Standard	1.0 (1.0–1.0)	0.84 (0.62–1.0)	0.84 (0.88-1.0)
Overall	0.88 (0.76–0.99)	0.79 (0.46–1.0)	0.95 (0.88-1.0)
Total Intrareader	0.88 (0.82–0.95)
Interscan Agreement (N = 60)	Scan-pairs
	Low-count-enhanced and standard
Reader 1	0.84 (0.76–0.91)
Reader 2	0.85 (0.76–0.93)
Reader 3	0.88 (0.81–0.95)
Overall	0.85 (0.81–0.90)