MAPT and Parkinson disease: As concerns the other forms of dementia, when using p-tau/Aβ1-42 ratio, the percentage of AD-continuum was 40.1% in FTD patients (n = 43/107), 37.8% in LBD (n = 14/37), 16.7% in CBS/PSP (n = 2/12), 0% in PD (n = 0/5), 43.3% in VaD/mixed (n = 29/67), 61.4% in MCI (n = 81/132) and 0% in CU (n = 0/9; Additional file 3).