Table 3.

Results from the n-back task at levels 1, 2 and 3 back.

		ε2+		ε33		ε4+
Accuracy		Co-efficient	P-value	Co-efficient	P-value	Co-efficient	P-value
	Multi-level regression	0.036 (0.003–0.069)	0.034*	Reference group		0.008 (−0.23 to 0.040)	0.590
	LR test for overall effect	p = 0.091
Reaction time		Co-efficient	P-value	Co-efficient	P-value	Co-efficient	P-value
	Statistical evidence from multi-level regression	−0.001 (−0.111 to 0.110)	0.987	Reference group		−0.021 (−0.125 to 0.083)	0.694
	LR test for overall effect	p = 0.888