Clinical utility of the cogstate brief battery in identifying cognitive impairment in mild cognitive impairment and Alzheimer’s disease

Table 4 Test-retest reliability and group mean (standard deviation) of each clinical group over a four month assessment period

				Month 1		Month 2		Month 3		Month 4
	Composite	ICC (95% CI)	p	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Overall	Attention	0.90 (0.87, 0.92)	<.0001	96.46	11.97	95.79	15.65	95.66	11.79	97.37	23.16
	Memory	0.95 (0.93, 0.96)	<.0001	93.03	14.09	94.16	13.3	95.17	14.6	96.39	14.76
HC	Attention	0.94 (0.92, 0.96)	<.0001	100	8.86	98.86	9.08	99.26	8.81	101.27	27.59
	Memory	0.78 (0.70, 0.85)	<.0001	99.92	8.05	100.73	8.37	102.61	8.86	104.57	7.39
MCI	Attention	0.94 (0.90, 0.97)	<.0001	95.69	11.73	93.66	11.6	93.9	12.53	95.42	11.33
	Memory	0.86 (0.78, 0.92)	<.0001	92.18	10.99	92.16	9.51	92.53	11.03	93.89	10.02
AD	Attention	0.77 (0.58, 0.89)	<.0001	86.76	14.83	88.96	28.53	86.56	13.8	88.04	14.65
	Memory	0.91 (0.84, 0.96)	<.0001	73.4	13.07	75.95	12.26	75.1	13.11	75.16	13.46

Note: ICC = Intra-class correlation coefficient; HC = healthy controls; MCI = mild cognitive impairment; AD = Alzheimer’s disease; Attention/psychomotor composite = average of the standardized Detection and Identification scores; Learning/working memory composite = average of the standardized One Card Learning and One Back scores.

ISSN: 2050-7283