Table 3.

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

Compared value	BA bias (95% CI)	Mean absolute difference in scores	Limits of agreement	ICC
Reader 1
Total CAC score	−32.6 (−58.4, −6.8)	82.3	(−394.5 – 329.2)	0.86 (0.81,0.89)
LM score	−0.4 (−5.0, 4.2)	12.2	(−64.8 – 64.0)
LAD score	−15.3 (−31.1, 0.6)	48.6	(−237.5 – 207.0)
LCX score	−9.1 (−17.9, −0.4)	26.4	(−131.4 – 113.2)
RCA score	−7.8 (−23.8, 8.2)	36.6	(−232.6 – 217.0)
Reader 2
Total CAC score	−18.4 (−39.4, 2.5)	66.4	(−311.9 – 275.1)	0.90 (0.87,0.92)
LM score	−0.5 (−4.7, 3.7)	10.7	(−58.9 – 57.8)
LAD score	−16.1 (−31.4, −0.8)	45.9	(−230.9 – 198.8)
LCX score	−14.5 (−30.9, 1.9)	30.7	(−244.5 – 215.5)
RCA score	12.7 (−1.9, 27.2)	34.1	(−191.6 – 217.0)

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