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Fig. 5. —Scatterplot shows Bland-Altman plot of absolute value of difference in calcium volume scores (CVS) between scan pairs versus mean CVS of two scan pairs. Line represents nonparametric regression line of absolute value of difference in CVS compared to mean CVS (rho = 0.00, p = 0.97). CVS^0.45 = CVS raised to the 0.45 power, (CVS₁)^0.45 = CVS raised to the 0.45 power from initial electron beam CT scan, (CVS₂)^0.45 = CVS raised to the 0.45 power from second electron beam CT scan obtained after 5-min rest. Rho denotes the Spearman's rank correlation.