LRRK2 and Parkinson disease: Similarly, participants with LRRK2 PD had longer mean (SD) duration of motor symptoms at baseline assessment (8.3 [6.5] years) compared with participants with idiopathic PD (5.5 [4.9] years; P < .001) or GBA PD (6.9 [5.9] years; P = .046) but not LRRK2/GBA PD (6.0 [6.7] years; P = .13).