PAF1 and Parkinson disease: Notably, SR and SL/H yield very large effect sizes (d ≥ 1.6) with power ≥ 0.99 in both HC vs. PD2 and HC vs. PD1 comparisons, and SPR also exhibits d > 1.4 with power > 0.99 when distinguishing PD severity (HC vs. PD2 and PD1 vs. PD2).