Table 1.

Group Characteristics of the ADHD and TD Group.

	ADHD (n = 63)		TD (n = 67)		ADHD vs. TD
% boys (n)	68.25 (43)		59.70 (40)		χ2 = 1.03
	M	SD	M	SD
Age	10.49	1.24	10.16	1.32	t = −1.43
Estimated IQ	97.68	13.82	106.10	12.93	t = 3.45**
DBD parents
Inattention	17.46	4.40	3.78	2.98	t = −20.86**
Hyperactivity/impulsivity	13.21	5.32	3.06	2.75	t = −13.78**
ODD	7.21	4.28
CD	1.68	2.43
DBD teacher
Inattention	16.40	4.88
Hyperactivity/impulsivity	11.89	6.91
ODD	4.92	4.82
CD	1.14	2.24
DISC parents
Inattention	7.83	1.16
Hyperactivity/impulsivity	6.22	2.40
ODD	2.95	2.29
CD	0.46	1.08

Note. TD = typically developing controls; DBD = Disruptive Behavior Disorder Rating Scale; ODD = oppositional defiant disorder; CD = conduct disorder; DISC = Diagnostic Interview Schedule for Children.

^**p < .01.