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18F-Flortaucipir binding potential (BPND) in controls, PD low dementia risk, and PD high dementia risk patients. The boxplots show the median and interquartile range. *Significant difference between PD high dementia risk patients and controls. #Significant difference between PD low dementia risk patients and controls. Tukey whiskers demarcate furthest values that lie within 1.5 interquartile ranges.
