MAPT and normal pressure hydrocephalus: Age was significantly correlated with the levels of CSF Aβ42 and p-tau in the probable NPH group (r = 0.460, p = 0.004; and r = 0.444, p = 0.006; respectively) but not in the unlikely NPH group (r = 0.09, p = 0.674; and r = 0.381, p = 0.066; respectively) or in the normal controls (r = −0.221, p = 0.289; and r = 0.330, p = 0.107; respectively) (Fig. 3).