Psychometric Properties of the Apathy Scale in Advanced Parkinson’s Disease

Table 4

Differences in assessments between baseline and follow-up.

Total score	Baseline				Follow-up				Wilcoxon test ()
	Mean	SD	Min	Max	Mean	SD	Min	Max
Apathy Scale	11.69	6.67	1	24	12.34	6.52	1	25	0.46
PFS-16	60.17	11.48	32	78	49.60	14.40	16	76	0.0001
UPDRS III	29.04	13.82	4	55	22.89	11.55	2	44	0.0007
UPDRS IV	8.56	2.66	3	13	4.36	2.42	0	11	<0.0001
Beck Anxiety Inventory	20.12	9.72	0	41	13.60	10.39	1	42	0.0003
Beck Depression Inv.-II	18.45	9.71	1	46	12.64	10.31	0	49	0.0017
NMSS	83.83	33.35	29	167	48.13	29.79	3	124	<0.0001
PDQ-39	46.74	13.59	10.9	85.9	33.66	16.87	4.49	72.44	<0.0001
Zarit Burden Interview	24.27	13.67	4	64	24.40	14.28	1	61	0.64

In 53 patients who completed the study. PFS-16, Parkinson’s Fatigue Scale; Beck Depression Inv.-II, Beck Depression Inventory-II; NMSS, Non-Motor Symptoms Scale; PDQ-39, Parkinson’s Disease Questionnaire-39 Items; UPDRS, Unified Parkinson’s Disease Rating Scale.