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Density map of the mean florbetapir PET average SUVR in former American football players by diagnostic group. Diagnostic groups: C-M-D-, cognitively normal (CN); C + M-D-, subjective memory complaint (SMC); C + M + D-, mild cognitive impairment (MCI); C + M + D + , dementia (DEM). Y axis = number of subjects. X axis = average SUVR scores. Elevated florbetapir is defined by an average SUVR of 1.10 or greater
