Besides the parameters listed in Fig. 3, Nfl plasma and other parameters (Aβ1–42, Aβ1–40, Aβ1–38, P-tau-181, weight, height, all available MoCa values, sex, age, aao – age at onset, PDdd – PD disease duration, CSF NfL levels, MDS UPDRS III score) were checked via correlation analysis as well. Here, NEFL is linked to Parkinson disease.