Table 2.

Intra- and inter- observer reproducibility of PCAT measurement

PCAT Volumes	Intra-observer			Inter-observer
	Mean Actual Difference(cm3)	Percent Difference	ICC	Mean Actual Difference(cm3)	Percent Difference	ICC
Proximal 40 mm distance
All coronaries	0.27 ± 0.91	0.61%	0.997	1.38 ± 3.32	3.00%	0.951
LAD	0.0 ± 0.25	0.14%	0.995	0.32 ± 1.02	1.15%	0.876
LCx	0.16 ± 0.55	1.47%	0.987	0.69 ± 2.20	5.22%	0.791
RCA	0.16 ±0.52	0.21%	0.997	0.37 ± 1.21	2.25%	0.982
Entire Vessel length
All coronaries	4.53 ± 15.27	7.71%	0.804	28.39 ± 17.29†	29.73%	0.405
LAD	1.06 ± 7.38	5.64%	0.667	6.45 ± 5.60†	20.63%	0.511
LCx	4.03 ± 9.93	36.11%	0.209*	8.21 ± 9.10	35.83%	0.181*
RCA	0.56 ± 10.52	1.94%	0.708	13.74 ± 10.58†	30.56%	0.395
Proximal anatomical segments
All coronaries	3.47 ± 3.33†	19.89%	0.891	5.32 ± 4.05†	32.22%	0.802
LAD	0.53 ± 0.87	12.23%	0.937	0.13 ± 1.47	1.77%	0.901
LCx	0.11 ± 2.09	3.61%	0.365*	0.64 ± 1.64	3.58%	0.381*
RCA	1.02 ± 2.66	11.27%	0.887	3.88 ± 2.62†	30.04%	0.688
Proximal two anatomical segments
All coronaries	23.09 ± 20.0†	47.90%	0.378	19.63 ± 12.52†	39.31%	0.670
LAD	0.73 ± 0.77†	9.80%	0.956	0.91 ± 3.87	3.55%	0.603
LCx	4.03 ± 10.0	36.11%	0.209*	8.69 ± 9.10†	40.36%	0.175*
RCA	0.85 ± 7.04	4.25%	0.740	6.53 ± 4.17†	21.70%	0.596

Intra-observer and inter-observer reproducibility of each measure were reported as ICC with all p<0.05, except for *p=nonsignificant. All p-values for the mean actual difference were nonsignificant except for †p≤0.01.

Proximal anatomical segments includes only segments 1, 5, 6, and 11. Proximal two anatomical segments include only segments 1, 2, 5, 6, 7, 11 and 13. LAD denotes left anterior descending artery; LCx, left circumflex artery; RCA, right coronary artery; ICC, intraclass correlation coefficient.