FIG 4. Box plots of peak ratios (NAA/Cho, NAA/Cr, and Cho/Cr) among controls subjects and patients with PC, FTD, CBD, and PPA. The box stretches from the lower hinge (defined as the 25th percentile) to the upper hinge (defined as the 75th percentile), and the median is shown as a line across the box. Outside the box, 10th and 90th percentile lines are shown. A statistically significant decrease in NAA/Cho was found in the right basal ganglia among patients with PC (P = .028). NAA/Cr ratio from the right perisylvian regions in patients with PPA and CBD were lower than that in control subjects (P = .025 and P = .025, respectively). No statistically significant difference in peak ratio was found in the left perisylvian regions or the left basal ganglia.