An Exploration of Apathy and Impulsivity in Parkinson Disease

Table 5

Forced linear regressions with Apathy Evaluation Scale, Clinician version- (AES-C-) derived factors 1 and 2 as the dependent variables.

AES-C-derived factor	Independent variables contributing to the variance	Statistic
Factor 1: “cognitive-behavioral”	HADS anxiety	𝑅^2=0.48;𝑃<0.001; constant 𝐵=10.89; (SEB 2.03)
	HADS depression
	MMSE serial sevens
Factor 2: “social indifference”	HADS anxiety	𝑅^2=0.22;𝑃<0.001; constant 𝐵=3.07; (SEB 0.40)
	NPI sleep
	HADS depression

HADS: Hospital Anxiety and Depression Scale.
MMSE: Mini-Mental State Examination.
NPI: Neuropsychiatric Inventory.