Socio-demographic and clinical characteristics of the individuals in the three experimental groups.

*Indicates a significant difference from both aMCIPD and aMCINPD subjects (p<0.01 in both cases) resulting from application of Tukey’s HSD test for unequal samples. UPDRS: Unified Parkinson’s disease Rating Scale-Part III [34]. PDaMCI: PD patients with amnestic mild cognitive impairment (isolated or associated with other cognitive changes). aMCINPD: individuals with amnestic mild cognitive impairment (isolated or associated with other cognitive changes) without PD.