Fig. 4From: Movement smoothness during a functional mobility task in subjects with Parkinson’s disease and freezing of gait – an analysis using inertial measurement unitsCorrelation map between SPARC metrics and questionnaires. a Most pronounced correlations occurred during sit to stand, walk 1, turn and stand to sit phases. Briefly, the turn phase showed consistent correlations with postural stability scores; FOG-Q showed consistent correlations with walk 1 and stand to sit TUG phases; and full TUG correlated consistently with postural instability and H&Y scores, but partially with posture, bradykinesia and hyperkinesia scores. b SPARC Acc A AP correlated with full TUG duration. c-e Graphs of selected correlations – red letters in a (see Table 3 for full correlation data). nPD = 31; red rectangles in a are p < 0.05; *p < 0.05Back to article page