Fig. 4

Performance error and variability parameters by group and leg. Significant main effect for group was found for all parameters indicating increased error and variability in persons with stroke (PwS) than in controls. Significant group by leg interaction was found for the end point variable error and the COP variable error indicating greater variability in the paretic leg than in controls. *post-hoc comparisons demonstrating significant differences between the paretic and non-paretic leg in PwS and between the non-paretic leg and control legs (p < 0.05); ^Ɨ Values after controlling for number of in-target touches. Abbreviations: COP, center of pressure