Table 2 Group mean (SD) of performance on the CogState performance measures in the control subjects assessed repeatedly over 19 days in their homes.

Measure	1	3	5	7	9	11	13	15	17	19	F (time)	WSD	CV
Speed measures (log10 RT)
Detection	2.50 (0.07)	2.48 (0.07)	2.48 (0.07)	2.47 (0.07)	2.47 (0.05)	2.48 (0.06)	2.47 (0.06)	2.48 (0.06)	2.48 (0.06)	2.48 (0.07)	0.1	0.04	0.016
Identification	2.69 (0.07)	2.69 (0.07)	2.70 (0.07)	2.70 (0.07)	2.70 (0.07)	2.69 (0.07)	2.70 (0.07)	2.69 (0.07)	2.71 (0.07)	2.70 (0.07)	0.8	0.05	0.016
Monitoring	2.57 (0.08)	2.58 (0.08)	2.57 (0.08)	2.57 (0.08)	2.58 (0.08)	2.58 (0.08)	2.58 (0.08)	2.57 (0.08)	2.57 (0.08)	2.58 (0.08)	0.10	0.06	0.020
Working memory	2.94 (0.10)	2.85 (0.10)	2.84 (0.09)	2.84 (0.10)	2.83 (0.11)	2.84 (0.10)	2.83 (0.10)	2.84 (0.09)	2.84 (0.10)	2.84 (0.11)	0.11	0.05	0.012
Accuracy measures (arcsine correct)
Working memory	1.22 (0.11)	1.32 (0.11)	1.32 (0.11)	1.31 (0.09)	1.32 (0.11)	1.34 (0.10)	1.32 (0.11)	1.32 (0.11)	1.34 (0.12)	1.32 (0.11)	0.8	0.14	0.10
Memory	0.89 (0.16)	0.95 (0.15)	0.95 (0.16)	0.96 (0.16)	0.95 (0.17)	0.97 (0.16)	0.99 (0.16)	0.95 (0.20)	0.98 (0.16)	0.99 (0.16)	0.09	0.15	0.15

CV, Coefficient of variation.