marginally significantP = .05
There was a statistically significant moderate positive correlation between total brain volume (%ICV) and EZ-RPE volume in PD group (Pearson correlation coefficient 0.482, P = .04), normal cognition control group (Pearson correlation coefficient 0.514, P < .01) and a marginally significant moderate positive correlation in AD dementia group (Pearson correlation coefficient 0.526, P = .05) ( Fig 3 ).