Table 5.

Results of cognitive tests given (T scores)

	M1		M2		Statistics
	Mean	SEM	Mean	SEM	(p  value; paired samples t test; *Wilcoxon signed rank test)
Attention
Work performance series
Total items worked	50.69	1.32	54.74	1.32	*p < 0.001
Errors	43.08	1.70	42.33	1.61	*p = 0.63
Increase of items worked	50.21	1.53	47.85	1.71	*p = 0.21
Executive function
STROOP test
Reading interference	51.15	1.42	51.23	1.28	p = 0.945
Naming interference	52.51	1.52	53.85	1.39	p = 0.233
Baseline condition: speed reading words	60.38	1.58	65.15	1.59	p < 0.001
Baseline condition: speed naming colours	59.69	1.40	63.67	1.56	p < 0.001
Interference condition: speed reading words	58.44	1.66	61.79	1.68	p = 0.001
Interference condition: speed naming colours	59.33	1.74	63.44	1.76	p < 0.001
Response inhibition
Comission errors	49.92	1.21	52.31	1.39	*p = 0.082
Omission errors	48.64	1.00	48.59	1.20	*p= 0.746
Sensitivity index	50.31	1.21	52.18	1.57	p = 0.237
Mean time “correct answers”	51.77	1.67	51.69	1.72	p = 0.939
Working Memory
N-back verbal
Correct answers	65.36	2.73	70.23	2.39	*p = 0.012
Omissions	59.36	2.45	64.90	2.42	*p = 0.011
Errors	56.46	1.16	59.00	1.09	*p = 0.038
Mean time “correct answers”	57.54	1.62	61.67	1.31	*p = 0.011
California verbal learning test (CVLT)
Learning sum	45.21	1.48	43.56	1.45	p = 0.181
Delayed free recall I	48.18	1.28	50.33	1.66	p = 0.061
Delayed free recall II	46.51	1.64	50.33	1.48	p = 0.007
Cued recall I	46.92	1.35	46.69	1.73	p = 0.825
Cued recall II	47.31	1.33	46.74	1.58	p = 0.601
Semantic clustering	35.85	0.21	31.03	0.26	*p < 0.001
Serial clustering	56.21	1.51	54.97	2.26	p = 0.578
Learning curve	46.92	1.67	50.18	1.80	*p = 0.094