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Fig. 4 —Diagnostic accuracy in relation to variability of 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 significant decrease in diagnostic accuracy with increasing heart
rate variability (Pearson r = -0.61, p < 0.01). Circles
indicate individual patients represented by overall diagnostic accuracy
(y-axis) plotted against SD of heart rate during data acquisition
(x-axis).
