MAPT and normal pressure hydrocephalus: When CSF Aβ42, t-tau and p-tau were compared between the probable NPH group and AD group, lower levels of CSF p-tau and t-tau were found in the probable NPH group compared to the AD group (26.05 ± 9.2 vs. 114.95 ± 28.2 pg/mL, p < 0.001; and 193.29 ± 92.3 vs. 822.65 ± 311.5 pg/mL; respectively) but the mean CSF Aβ42 was low in both the probable NPH and AD group (444.22 ± 163.3 vs 493.20 ± 139.8 pg/mL, p = 0.703).