Table 2.

Per-vessel inter-reader agreement (Reader 1 - Reader 2) for standard CAC scans and ungated CTAC scans.

Compared value	Bias (95% CI)	Mean absolute difference in scores	Limits of agreement	ICC
CAC scans
Total CAC score	−5.3 (−14.3, 3.8)	12.2	(−132.6 – 122.1)	0.96 (0.95,0.97)
LM score	−3.8 (−6.7, −0.9)	6.7	(−44.4 – 36.9)
LAD score	−0.5 (−12.1, 11.1)	15.9	(−163.0 – 162.1)
LCX score	−1.9 (−7.5, 3.7)	6.3	(−80.8 – 77.0)
RCA score	0.9 (−1.5, 3.3)	4.5	(−32.6 – 34.4)
CTAC scans
Total CAC score	9.0 (−7.0, 25.0)	41.8	(−216.1 – 234.0)	0.90 (0.87,0.92)
LM score	−3.9 (−8.5, 0.7)	11.3	(−68.3 – 60.6)
LAD score	−1.3 (−9.3, 6.8)	17.8	(−113.7 – 111.1)
LCX score	−7.3 (−21.8, 7.3)	22.5	(−211.3 – 196.8)
RCA score	21.4 (2.6, 40.0)	26.8	(−242.3 – 285.0)

Abbreviations: BA – Bland-Altmann, ICC – interclass correlation coefficient, CTAC – CT attenuation correction. LM – left main coronary artery, LAD – left anterior descendent coronary artery, LCX – left circumflex coronary artery, RCA – right coronary artery