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Fig. 4. —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 = –0.27, p
< 0.001). CVS0.33 = cube root transformation of CVS,
(CVS1)0.33 = cube root of CVS from initial electron beam
CT scan, (CVS2)0.33 = cube root of CVS from second
electron beam CT scan obtained after 5-min rest. Rho denotes Spearman's rank
correlation.
