An Exploration of Apathy and Impulsivity in Parkinson Disease

Table 2

Rotated component matrix for the Barratt Impulsiveness Scale-11 resulting in a five-factor solution and the Apathy Evaluation Scale, Clinician version, resulting in a two-factor solution.

Factor name	Item	Component					Cronbach’s α
Barratt Impulsiveness Scale-11
		1	2	3	4	5
Inattention	(28) I am restless at the theatre or lectures.	0.68					0.76
	(20) I am a steady thinker.	0.64
	(9) I concentrate easily.	0.63			0.42
	(26) I often have extraneous thoughts when thinking.	0.63
	(5) I do not “pay attention.”	0.58
Impetuosity	(6) I have “racing” thoughts.		0.75				0.81
	(19) I act on the spur of the moment.		0.67
	(14) I say things without thinking.		0.67
	(17) I act “on impulse.”		0.67
	(2) I do things without thinking.		0.50
Personal Security	(25) I spend or charge more than I earn.			0.82			0.78
	(10) I save regularly.			0.78
	(13) I plan for job security.			0.65
	(8) I am self-controlled.	0.44		0.59
Planning	(7) I plan trips well ahead of time.				0.81		0.72
	(1) I plan tasks carefully.				0.75
	(12) I am a careful thinker.				0.56
Future orientation	(27) I am more interested in the present than the future.					0.85	0.72
	(30) I am future orientated.					0.75
Apathy Evaluation Scale, Clinician version
				1	2
Cognitive-behavior factor	(6) S/he puts little effort into anything.			0.80			0.907
	(1) S/he is interested in things.			0.79
	(8) Seeing a job through to the end is important to her/him.			0.78
	(10) Someone has to tell her/him what to do every day.			0.76
	(15) S/he has an accurate understanding of her/his problem.			0.75
	(18) S/he has motivation			0.74	0.45
	(11) S/he is less concerned about her/his problems than s/he should be.			0.70
	(16) Getting things done during the day is important to him/her.			0.70
	(9) S/he spends time doing things that interest her/him.			0.67	0.55
Social indifference factor	(13) Getting together with friends is important to him/her.				0.87		0.84
	(12) S/he has friends.				0.83
	(14) When something good happens, s/he gets excited.				0.79

Extraction method: Principal Components Factor Analysis. Rotation method: varimax with Kaiser normalisation. Converged in 9 iterations for the BIS-11 and 3 iterations for the AES-C; BIS-11 reliability analysis: the alpha coefficients for factor 1 (inattention) were 0.757 and for factor 2 (impetuosity) were 0.807, reflecting very strong internal reliability. The remaining three factors had the following alpha values: factor 3 (personal security), 0.784; factor 4 (planning), 0.719; and factor 5 (future orientation), 0.724. AES-C reliability analysis: the alpha coefficient for factor 1 was 0.907 and 0.841 for factor 2, both reflecting very strong internal reliability.