APOE and Parkinson disease: The χ2 post-hoc analyses show that there is an almost equal distribution of APOE genotypes across HC, SWEDD, and PD for ε2/ε2, ε2/ε3, ε3/ε4, and ε4/ε4 APOE genotypes (p > 0.05) (see Supplementary Table S3).