Table 3.

Results of cognitive tests (T-scores).

	PA					CI
Attention and working speed		Mean		SEM	Paired t-test		Mean		SEM	Paired t-test
Work performance series
Numbers worked	Before	48.96	±	1.73		Before	52.89	±	3.03
	After	53.35	±	1.72	p < 0.001	After	54.78	±	2.43	n.s.
	Δafter-before	4.39	±	0.59		Δafter-before	1.89	±	1.63
Errors	Before	51.83	±	2.22		Before	42.89	±	3.03
	After	52.26	±	2.21	n.s.	After	50.00	±	1.57	p < 0.05
	Δafter-before	0.43	±	1.99		Δafter-before	7.11	±	3.00
Trail making test
Part A	Before	49.61	±	0.95		Before	51.28	±	1.54
	After	54.39	±	1.41	p < 0.001	After	54.78	±	2.50	n.s.
	Δafter-before	4.78	±	1.08		Δafter-before	3.47	±	1.79
Part B	Before	52.83	±	1.27		Before	50.39	±	2.13
	After	58.87	±	1.65	p < 0.001	After	54.83	±	2.31	p < 0.001
	Δafter-before	6.04	±	1.27		Δafter-before	4.44	±	1.03
Executive function		Mean		SEM	Paired t-test		Mean		SEM	Paired t-test
STROOP
Baseline reading	Before	52.13	±	1.54		Before	51.50	±	2.02
	After	57.57	±	1.74	p < 0.001	After	52.50	±	2.11	n.s.
	Δafter-before	5.43	±	0.93		Δafter-before	1.00	±	1.13
Baseline naming	Before	52.00	±	1.79		Before	50.28	±	2.34
	After	55.57	±	1.91	p < 0.001	After	51.83	±	1.95	n.s.
	Δafter-before	3.57	±	0.88		Δafter-before	1.56	±	1.91
Interference reading	Before	49.96	±	1.51		Before	45.50	±	2.96
	After	50.48	±	1.80	n.s.	After	46.44	±	2.02	n.s.
	Δafter-before	0.52	±	1.94		Δafter-before	0.94	±	2.64
Interference naming	Before	51.48	±	2.06		Before	52.89	±	2.67
	After	50.22	±	1.80	n.s.	After	48.33	±	1.65	n.s.
	Δafter-before	−1.26	±	1.77		Δafter-before	−4.56	±	2.73
Response Inhibition
Commission errors	Before	48.61	±	1.96		Before	49.06	±	2.60
	After	52.26	±	2.17	p < 0.05	After	51.33	±	2.76	n.s.
	Δafter-before	3.65	±	1.40		Δafter-before	2.28	±	2.16
Omission errors	Before	44.78	±	1.97		Before	45.89	±	2.19
	After	49.39	±	1.82	p < 0.05	After	48.72	±	2.25	n.s.
	Δafter-before	4.61	±	1.80		Δafter-before	2.83	±	1.96
Sensitivity index	Before	46.74	±	2.25		Before	47.78	±	3.01
	After	52.13	±	2.20	p < 0.01	After	50.28	±	2.60	n.s.
	Δafter-before	5.39	±	1.57		Δafter-before	2.50	±	2.09
Tower of London
	Before	55.83	±	2.00		before	54.22	±	1.61
	After	57.87	±	1.35	n.s.	after	55.56	±	2.51	n.s.
	Δafter-before	2.04	±	1.85		Δafter-before	1.33	±	2.59
Working memory	Mean	SEM	Paired t-test		Mean		SEM	Paired t-test
N-back-verbal
Correct answers	Before	55.65	±	3.94		Before	54.61	±	3.95
	After	73.22	±	2.76	p < 0.001	After	67.00	±	4.03	p < 0.01
	Δafter-before	17.57	±	4.49		Δafter-before	12.39	±	3.76