MGP and Huntington disease: In sensitive analyses, shown in Tables S3 and S4, an increased dp-uc MGP level was independently associated with a per 1-SD increase in PAG (coefficient 0.47, p < 0.0001, model R2 = 0.31) and TMAO (coefficient 0.19, p = 0.006, model R2 = 0.13) in HD patients (n = 261), and a significant association was observed among dp-uc MGP and PAG in PD patients (coefficient 0.29, p = 0.008, model R2 = 0.25; n = 125).