To investigate how different walking episodes were related to clinical freezings, we correlated the PAC in episodes of rest standing (PACstand), stable walking (FN and NN, PACstable) and unstable walking (FF, and 5 s with highest FI in the non-freezing trial, PACunstable,Fig. 4A) to the three indices of freezing severity after regressing out the effect of subjects using linear mixed effect models. We observed that PACstable, but not PACunstable, were significantly correlated with all three indices of freezing severity (Bonferroni corrected P < 0.05, Fig. 4B–D).
