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Fig. 3 —Diagnostic accuracy in relation to average heart rate during CT. Linear regression plot shows overall diagnostic accuracy for assessment of coronary artery stenosis calculated for each patient as sum of true-positive and true-negative ratings divided by number of segments per patient. Dotted lines represent 95% confidence limits. Linear correlation indicates no significant dependence of diagnostic accuracy on average heart rate (Pearson r = -0.05, p = 0.79). Circles indicate individual patients represented by overall diagnostic accuracy (y-axis) plotted against average heart rate during scan acquisition (x-axis).