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The Aβ1–42/P-Tau and Aβ1-42/T-Tau ratios do not allow discriminating between the mild cognitive impairment (MCI) ⩽1.5 group and controls (CTRL). P-Tau, phosphorylated Tau; T-Tau, total Tau. The Aβ17-40/Aβ11-40 ratio significantly differentiates the MCI ⩽1.5 group from controls. The symbol ‘–' indicates P>0.05; *P<0.05; **P<0.01.
