(b).

	Before intervention	After intervention	t	P
BrainPower	6.85 ± 2.46	9.66 ± 1.85	8.478	<0.001
Placebo	7.37 ± 2.32	9.39 ± 1.98	6.988	<0.001
t	−1.08	0.692
P	0.283	0.491