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Inter scan concordance matrices and Bland-Altman plots for ECG-gated CAC scan and low-dose ungated CTAC scan by the same reader. Bland-Altman plots are composed using the percentage of difference vs. mean to better illustrate the agreement in clinically important low-calcium ranges. CAC categories: No CAC: 0, Very Low: 1–10, Low: 11–100, Moderate: 101–400, High: >400; CAC – coronary artery calcium, CTAC – computed tomography attenuation correction
