The established 3-dimensional model was based on the linear discriminant function, as shown below, to illustrate the samples’ 3D scatter plot and to accurately classify the three dementia groups and controls (Figure 3).f = 0.01408Tau + 0.26819pTau − 0.0040Aβ40 + 0.06062Aβ42 + 0.37553log(α − synuclein)(1). This evidence concerns the gene SNCA and dementia.