LRRK2 and Parkinson disease: In Part III, the motor examination, having a LRRK2 mutation (OR = 6.74 (1.62, 28.00), p = 0.009), total hysterectomy (OR = 5.46 (1.74, 17.18), p = 0.004), and being diagnosed with B12 deficiency (OR = 6.22 (1.69, 22.95), p = 0.006) were significantly associated with higher PD severity.