COMT and Parkinson disease: Regarding the role of COMT in influencing cognitive, motor function and complications in PD, both p.Val158Met (Effect Allele=G; BETA=−0.338; SE=0.150, p=0.024, Bonferroni-corrected p=1) and p.His62=(Effect Allele=C; BETA=−0.330; SE=0.149, p=0.027, Bonferroni-corrected p=1) showed nominal associations with MoCA scores in the GP2 EUR ancestry group.