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Random forest classification of Alzheimer's disease (AD) converters and healthy female controls. Mean decrease in Gini index of features retained by the final model. Higher mean decrease in Gini index indicates greater importance of that feature in the model. +/− indicates the direction of the relationship of the feature with AD class, for example, lower total brain volume was associated with AD class. Abbreviation: APOE4 = apolipoprotein ɛ4 genotype.
