Fig. 2

The effect of RBD on specific cognitive domains in early PD subjects. Cognitive decline by Δ%HVLT total recall, Δ%HVLT Recognition Discrimination, Δ% Benton Judgment of Line Orientation, Δ%Symbol Digit Modalities, Δ% Letter-Number Sequencing and Δ%Semantic Fluency from baseline to 36 month in PD with RBD and without RBD. Results are mean ± (SD). P value was assessed using two-tailed Student t test for each variable. *P value statistically significant. Abbreviations: RBD, Rapid eye movement sleep behavioral disorder; HVLT, Hopkins Verbal Learning Test