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Linear spline coefficients for early-stage amyloidosis in the ADNI sample. Boxplots of linear spline coefficients from the regression of the 18F-Florbetapir-PET SUVR values on CSF Aβ42 levels with the range sliding between the 16% quantile and the first tertile of 18F-Florbetapir-PET values. WhCer, whole cerebellum reference region; WM, white matter reference region.
