LRRK2 and Parkinson disease: Analogous to the patients with LRRK2-PD, PD patients who did not carry the p.Gly2019Ser variant and belonged to the EUR ancestry group had a younger median AAO than those from the AJ ancestry group, albeit with a smaller effect size (HR=0.78, 95% CI: 0.73–0.83, p=1.4×10−14).