Differential contribution of apathy and depression on cognitive functioning.

∧< .05, *< .005, in bold the significant value of the predictors. Regression analysis on the test scores that differentiated PD-NA and PD-A. The variables entered into the analysis were: AES score, HAMD-17, age, education, disease duration and LED. The analysis was performed on the entire sample of patients. Model summary reports the R squared and the results of the ANOVA test for the different dependent variables. We report the beta values only for the two predictors of interest (AES score and HAMD-17 score).