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

Table 1

Descriptive statistics of other measures in the study.

Measures	Mean	SD	Min	Max
Beck Anxiety Inventory	19.77	9.24	0	41
Beck Depression Inventory-II	18.11	9.34	1	46
Schwab and England Scale (“on state”)	69.84	23.77	10	100
Non-Motor Symptoms Scale-total score	83.05	32.07	29	167
Cardiovascular (including falls)	2.41	3.53	0	14
Sleep/fatigue	16.87	7.63	0	40
Mood/cognition	15.69	13.93	0	56
Perceptual problems/hallucinations	3.08	5.53	0	25
Attention/memory	5.80	6.11	0	24
Gastrointestinal tract	7.44	6.23	0	24
Urinary	12.44	9.59	0	36
Sexual function	7.80	8.16	0	24
Miscellaneous	11.51	8.68	0	36
PDQ-39 (summary index)	46.13	13.81	10.90	85.90
Mobility	66.88	22.31	2.50	100.00
Activities of daily living	54.65	24.48	4.17	95.83
Emotional well-being	47.92	21.70	4.17	100.00
Stigma	20.10	22.61	0	93.75
Social support	18.89	24.49	0	100.00
Cognitions	36.35	20.89	0	93.75
Communication	31.81	24.67	0	100.00
Bodily discomfort	45.69	20.73	0	100.00
Parkinson Fatigue Scale (PFS-16)	58.71	12.43	18.00	78.00
UPDRS-motor examination	30.05	14.06	4	58
UPDRS-complications	8.62	2.87	3	15
Zarit Burden Interview	25.30	13.47	4	64
Levodopa equivalent daily dose (mg)	1455.98	456.00	478.00	3110.00

Max, maximum; Min, minimum; PDQ-39, Parkinson’s Disease Questionnaire-39 Items; SD, standard deviation; UPDRS, Unified Parkinson’s Disease Rating Scale.