Table 1.

Descriptive statistics (pre and posttest) and between-group differences in D2 and EDAH.

		Experimental Group (n = 24)		Control Group (n = 20)		Differences
		M	SD	M	SD	p	η2
Performance measures
D2-TOT	PRE	321.05	75.71	313.81	76.03	0.754	0.002
	POST	403.25	102.02	357.80	91.45	0.013	0.145
D2-CON	PRE	130.40	31.77	132.33	49.75	0.877	0.001
	POST	166.97	45.64	144.56	37.17	0.009	0.157
D2-CR	PRE	132.97	31.69	137.71	49.82	0.704	0.003
	POST	168.69	45.23	147.07	36.15	0.002	0.210
Observation measures
EDAH-AD	PRE	7.06	3.198	7.60	3.033	0.573	0.008
	POST	7.23	2.859	7.23	2.859	0.668	0.005
EDAH-H/I	PRE	6.75	3.674	7.40	3.424	0.550	0.009
	POST	5.98	3.116	6.78	3.636	0.881	0.001
EDAH-ADHD	PRE	13.21	5.703	15.00	5.794	0.309	0.025
	POST	13.21	5.099	13.61	3.306	0.999	<0.001

Note. D2-TOT = Total-quality of attention; D2-CON = Concentration; D2-CR = Correct responses; EDAH-AD = Attention deficit symptoms; EDAH-H/I = Hyperactivity/impulsivity symptoms; EDAH-ADHD = Attention deficit and hyperactivity/impulsivity symptoms; PRE = Pretest; POST = Posttest.