Table 3.

Difference in CP, NCP, and LAP volumes based on the thresholds of method 1 (CP > 350 HU; NCP: 31 to 350 HU; LAP: − 100 to 30 HU) for different energy levels compared to T3D

Energy level (keV)	CP (> 350 HU)		NCP (31 to 350 HU)		LAP (− 100 to 30 HU)
	Difference to T3D (%)	95% CI	Difference to T3D (%)	95% CI	Difference to T3D (%)	95% CI
40	70.8	54.2 to 87.5	− 39.8	− 48.1 to − 31.5	− 18.8	− 29.0 to − 8.6
50	36.9	28.2 to 45.6	− 20.3	− 25.2 to − 15.5	1.9*	− 5.8 to 9.6
60	8.7	5.4 to 12.0	− 6.9	− 8.9 to − 4.9	13.6	7.5 to 19.6
70	0.9	0.1 to 1.6	− 5.1	− 6.4 to − 3.8	26.8	19.8 to 33.7
80	− 6.5	− 9.4 to − 3.6	− 7.3	− 9.7 to − 4.9	60.5	46.9 to 74.0
90	− 17.5	− 24.9 to − 10.0	− 7.4	− 11.4 to − 3.4	92.9	72.5 to 113.3
100	− 27.5	− 38.2 to − 16.8	− 7.6*	− 13.2 to − 2.0	122.9	96.1 to 149.7
110	− 34.8	− 47.6 to − 21.9	− 8.6*	− 15.3 to − 1.8	149.3	116.9 to 181.8
120	− 39.8	− 54.2 to − 25.5	− 9.8*	− 17.5 to − 2.2	171.2	133.9 to 208.4
130	− 43.4	− 58.9 to − 28.0	− 11.2*	− 19.6 to − 2.8	189.3	148.0 to 230.5
140	− 46.3	− 62.5 to − 30.0	− 12.4*	− 21.4 to − 3.5	204.7	160.2 to 249.2
150	− 48.3	− 65.3 to − 31.4	− 13.6*	− 23.0 to − 4.1	217.0	170.0 to 263.9
160	− 50.1	− 67.6 to − 32.6	− 14.5*	− 24.3 to − 4.7	227.4	178.4 to 276.4
170	− 51.4	− 69.4 to − 33.5	− 15.3*	− 25.4 to − 5.2	235.7	185.1 to 286.3
180	− 52.5	− 70.9 to − 34.2	− 15.9*	− 26.3 to − 5.5	242.5	190.5 to 294.6

Differences and 95% confidence intervals (CI) are from pairwise t-tests

^* indicates no statistical significance compared to T3D based on p value

CP, calcified plaque; HU, Hounsfield unit; LAP, low-attenuation non-calcified plaque; NCP, non-calcified plaque