Among 32 PD participants with self-reported Puerto Rican ethnicity, and 119 with non-Hispanic, non-Jewish European ancestry, those from Puerto Rico were more likely to harbor the LRRK2-p.G2019S variant than Europeans [Table 1A; 15.6% vs. 4.2%) (OR 4.22 (95% CI: 1.14–15.6)]. This evidence concerns the gene LRRK2 and Parkinson disease.