MAOB and Parkinson disease: Similarly, non-smokers with the "at-risk" AA genotype of MAOB rs1799836 (adjusted OR = 5.74, 95% CI = 2.16 - 15.2) had a higher risk of PD than those with the AG and GG genotypes combined (adjusted OR = 3.68, 95% CI = 1.30 - 10.4), relative to ever smokers with the AG and GG genotypes combined.