GBA1 and Parkinson disease: The association between RBD score and GBA1 non-coding rs3115534-G allele persisted after adjusting for PD case status (Beta = 0.2542, SE = 0.108, P = 0.019), showing that the association with GBA1 rs3115534-G and severity of pRBD is at least partially independent of PD case status in this dataset.