S100A8 and Tremor: Under the lenient significant threshold (Table 3 and Supplementary Table 5), genetically predicted HP CagA antibody level was negatively associated with the tremor/PIGD score ratio using the IVW method (β = -0.083; SE = 0.04; P = 0.018) and the weighted mode method (β = -0.193; SE = 0.09; P = 0.038).