Fig. 4

Heat plots with predicted probabilities for amyloid PET positivity in the total study population. Heat plots were constructed by filling out the logistic regression formula with constant = 0.839, and beta’s B = − 19.02 for Abeta_(1-42/1-40), B = 0.019 for GFAP, B = − 0.618 for age (dichotomous variable: younger (= 0) versus older (= 1) than cohort’s average age of 63 years) and B = 1.625 for APOE ε4 carriership (non-carrier = 0, carrier = 1). Abeta, amyloid beta; GFAP, glial fibrillary acidic protein; APOE, apolipoprotein E