Furthermore, patients in the PD‐DH group had also significantly lower levels of CSF Aβ42, tau, and P‐tau levels (53 pg/mL, 7.2 pg/mL, and 0.6 pg/mL lower than the PD group, with P = 0.014, 0.028, and 0.023, respectively), but no difference was found in the decline rates (Tables 3 and 4). Here, MAPT is linked to Parkinson disease.