Fig. 1.

Decision tree. Decision tree calculated by Classification And Regression Tree (CART) analysis. The tree was built in the training cohort and is validated in the validation cohort. Numbers in the boxes indicate the percentage of correctly classified subjects out of the total number of subjects in that group for the training cohort in which the tree was built. Groups are numbered from 1 to 4. Aβ42 and tau concentrations are shown in pg/ml. Abbreviations: SCD, subjective cognitive decline; AD, Alzheimer's disease; Aβ42, amyloid β 1-42; tau, total tau.