a trend toward significanceP = 0.065
In the PD‐specific analysis, right BF volume demonstrated a trend toward significance (HR = 1.017, 95% CI: 0.999–1.166, P = 0.065), with no significant association with left and bilateral BF volumes (HR = 1.009, P = 0.380; HR = 1.008, P = 0.120, respectively).