MAPT and normal pressure hydrocephalus: Agren-Wilsson et al. at the same time reported that CSF concentrations of t-tau, p-tau and Aβ42 were lower in iNPH compared to VD and healthy subjects [37], while Ray et al. (2011) showed a significant decrease in CSF Aβ42 concentration in NPH patients vs. healthy controls, but no significant difference in t-tau or p-tau between these two groups [38].