Figure 6: Box plots (indicating minimum, 25% quartile, median, 75% quartile, and maximum values) of transmural (left plot) and subendocardial (right plot) perfusion measurements in vascular regions with a normal CFR of at least 2.00 and a reduced CFR of less than 2.00. The mean MPRI for the segments with the three lowest transmural MPRI values (MPRItrans3) and those with the three lowest subendocardial MPRI values (MPRIsub3), are shown. The difference between regions with normal and reduced CFR was statistically significant (P < .001).