NEFL and parkinsonian disorder: However, the rate of NfL change was greater in the presymptomatic group (p = 1.9E-04), the aforementioned phenoconverters (p = 2.6E-07), and in participants with MBCI (p = 0.003), bvFTD (p = 1.1E-06), a PPA (p = 5.8E-08) or a Parkinsonian disorder (p = 0.003) when compared to controls (Fig. 4, Table S19).