On the opposite, proportions of a positive Aβ42/Aβ40 ratio, (13.64% [95% C.I. = 3.50:23.78] vs. 93.07% [95% C.I. = 88.12:98.02], χ2 = 90.35, p < 0.001, V = 0.79), p-tau (6.82% [95% C.I. = 0:14.27] vs. 88.12% [95% C.I. 81.81:94.43%], χ2 = 87.35, p < 0.001, V = 0.78) and t-tau (11.36 [95% C.I. = 1.99:20.74] vs. 84.16% [95% C.I. = 77.04:91.28], χ2 = 68.98, p < 0.001, V = 0.69) concentrations were significantly lower in the iNPH patients compared to the AD group (Table 1, Figure 3). Here, MAPT is linked to Alzheimer disease.