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Figure 5b. Graphs show regression curves of the window (a) width and (b) center ratios for mean PA attenuation values (measured in Hounsfield units), as measured by observer 2. Of the regression curves of the seven observers, those of observer 2 had the highest r2 values for width ratios (r2 = 0.59, P < .001) and center ratios (r2 = 0.40, P < .001). Each point corresponds to one of the 25 cases. The 95% confidence intervals are included in each plot.
