Validation of the Cognitive Assessment of Later Life Status (CALLS) instrument: a computerized telephonic measure

BMC Neurology

Table 4 Factor Loadings of CALLS Test

Rotated Component Matrix(a)
	Verbal Learning & Memory	Processing Speed	Attention and Working Memory	Verbal Fluency and Naming	Concept Formation
Alpha	0.883	0.731	0.555	0.457	0.179
Word List Trial 1	0.592
Word List Trial 2	0.767
Word Recognition	0.774
Word List Trial 3	0.792
Word List Cued Recall (Total)	0.829
Word List Delayed Free Recall	0.834
Choice RT Score Decile		0.559
Simple RT Right Score Decile		0.865
Simple RT Left Score Decile		0.893
DATE Score			0.373
Digit Span Backward (Span)			0.784
Digit Span Forward (Span)			0.804
President/VP Naming				0.799
F Words (30 Seconds)				0.504
Animal Naming (30 seconds)				0.456
Serial 7's				0.496
4 Word Naming					0.745
Similarities					0.732

Note: The extraction method was a Principal Component Analysis. The rotation method was Varimax with Kaiser Normalization. Rotation converged in 6 iterations. The CALLS Total coefficient alpha = 0.809. Choice RT = Choice Reaction Time; Simple RT = Simple Reaction Time.

ISSN: 1471-2377