Table 3 Results of regression analyses on baseline scores shows that combinations of education, age and Full Scale Intelligence Quotient (FSIQ) consistently predicted performance on the cognitive tasks

TASK	R ²	R ² adj	F	P	Factor	β	t	P
Letter cancellation	0.152	0.137	10.188	<0.0001	Education	0.489	1.889	0.061
					Age	−0.171	−2.734	0.007
					FSIQ	0.136	2.442	0.016
Auditory verbal learning task (AVLT)	0.109	0.98	10.444	<0.0001	Age	−0.049	−3.505	0.001
Supraspan					FSIQ	0.033	3.006	0.003
AVLT total	0.204	0.194	21.862	<0.0001	Age	−0.35	−5.319	<0.0001
					FSIQ	0.208	4.04	<0.0001
AVLT delayed	0.146	0.136	14.563	<0.0001	Education	0.304	0.085	<0.0001
					Age	−0.077	0.024	0.002
Complex figure immediate	0.112	0.101	10.689	<0.0001	Age	−0.209	−3.939	<0.0001
					FSIQ	0.104	2.509	0.013
Complex figure delayed	0.139	0.129	13.789	<0.0001	Age	−0.201	−4.169	<0.0001
					FSIQ	0.124	3.28	0.001
Story immediate recall	0.206	0.196	22.125	<0.0001	FSIQ	0.122	5.24	<0.0001
					Age	−0.125	−4.207	<0.0001
Story delayed recall	0.209	0.2	22.593	<0.0001	FSIQ	0.121	5.141	<0.0001
					Age	−0.134	−4.438	<0.0001
Letter/number sequencing	0.223	0.209	16.258	<0.0001	FSIQ	0.102	6.033	<0.0001
					Age	−0.075	−3.94	<0.0001
					Education	−0.179	−2.279	0.024
Digit span forward	0.212	0.207	46.278	<0.0001	FSIQ	0.094	6.803	<0.0001
Digit span backwards	0.221	0.212	24.205	<0.0001	FSIQ	0.086	6.593	<0.0001
					Age	−0.039	−0.2363	0.019
Spatial span forwards	0.118	0.108	11.453	<0.0001	Age	−0.053	−3.863	<0.0001
					FSIQ	0.031	2.906	0.004
Spatial span backwards	0.216	0.202	15.609	<0.0001	Education	0.15	2.663	0.008
					Age	−0.052	−3.77	<0.0001
					FSIQ	0.028	2.318	0.022
Stroop	0.084	0.079	15.722	<0.0001	Education	0.793	3.965	<0.0001

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