Table 3.

Correlation between Depression and Apathy in PDD.

Correlations	Depression	Apathy
Correlations present	There was an improvement in depression scores on the MADRS scale with increasing cognitive impairment on the SCOPA-Cog scale (r = .3695). Depression scores on the MADRS scale were greater in patients with more severe motor impairment (HY, r = .4988) and (UPDRS III r = .4483).	Apathy on the AES scale worsened as cognitive impairment increased (SCOPA-COG r = −.2578). Although there was a correlation between motor changes and cognitive impairment (r = −.4089), apathy was not correlated with worsening motor symptoms (UPDRS-III r = −.4390).
Correlations not present	Disease duration Duration of levodopa therapy	Disease duration Duration of levodopa therapy

Abbreviations: AES, Apathy Evaluation Scale; HY, Hoehn and Yahr; MADRS, Montgomery-Åsberg Depression Rating Scale; r, Pearson correlation coefficient; SCOPA-Cog, Scales for Outcomes in Parkinson’s Disease–Cognition; UPDRS-III, Unified Parkinson’s Disease Rating Scale.