Table A18.

Results from stepwise regression models for eyes closed alpha activity at electrode Cz.

		Unstandardized Coefficients		Standardized Coefficients
Step	Predictor	B	SE	β	p	R 2	ΔR2	F	p
1	Age	−0.009	0.002	−0.306	<0.0001	0.094	0.094	21.37	<0.0001
2	Age Inattention Hyp/imp	−0.010 0.034 −0.012	0.002 0.019 0.020	−0.324 0.144 −0.050	<0.0001 0.072 0.528	0.109	0.015	8.33	<0.0001
3	Age Inattention Hyp/imp Data quality (artifact-free segments in %)	−0.009 0.033 −0.019 −0.001	0.002 0.019 0.020 0.001	−0.292 0.140 −0.077 −0.116	<0.0001 0.080 0.339 0.102	0.120	0.012	6.97	<0.0001

N = 208. Hyp/imp = Hyperactivity/impulsivity. SE = standard error of B.