Table 1.

Summary of the demographic variables in the total sample and in the reduced sample after discarding the 12 subjects in which a high number of trials were contaminated by EEG artifacts

Sample	Number	Females %	Males %	Mean of age	Standard deviation of age
Full sample	167	50.90	49.10	15.8	6.06
Group: 6–9 years	33	51.52	48.48	7.48	1.14
Group: 10–13 years	32	53.13	46.87	11.47	1.16
Group: 14–17 years	32	50.00	50.00	15.5	1.14
Group: 18–21 years	33	48.49	51.51	19.55	1.15
Group: 22–26 years	37	51.35	48.65	24.02	1.44
Reduced sample	155	48.38	51.62	16.4	5.99
Group: 6–9 years	25	44	56	7.36	1.11
Group: 10–13 years	28	46.43	53.57	11.53	1.2
Group: 14–17 years	32	50	50	15.5	1.14
Group: 18–21 years	31	48.39	51.61	19.54	1.18
Group: 22–26 years	39	51.28	48.72	24.05	1.41