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Fig. 2C —Graphs show interscan variability of coronary artery calcium scoring for three heart rate groups. Interscan variability of Agatston (dark gray), volume (medium gray), and mass (white) scores on nine cardiac phases are shown for all patients (A); low-heart-rate group (B) and high-heart-rate group (C) are also shown. Graphs show means (bars), mean plus SD (upper vertical line), and median (lower vertical line). Two-factor factorial analysis of variance revealed significant differences between cardiac phases (p < 0.01); however, there were no significant differences among scoring algorithms (all patients, p = 0.46; low-heart-rate group, p = 0.58; and high-heart-rate group, p = 0.75). Scheffé test, however, showed no statistical difference between cardiac phases.