Furthermore, comparisons between IHC-quantified Aβ and AT-8 phospho-tau also reported a correlation only when the data were analysed as a single cohort (Braak stage 0-VI) combining non-AD controls and AD cases (r = 0.68, p < 0.0001, Fig. 2d.i), and not when examined as a separate data set of non-AD (Braak stage 0-IV) controls or AD (Braak stage V–VI) cases (p > 0.05, for both, Fig. 2dii + iii). This evidence concerns the gene MAPT and Alzheimer disease.