Table 1.

Basic demographic and clinical characteristics of sample

Group
	ADHD	Control	F/χ2	p
Demographics
N	116	127
Age in months	104.02 (11.68)	103.9 (12.83)	0.004	0.952
Est. IQa	111.05 (13.51)	115.77 (12.45)	8.104	0.005
% Male	69.8 %	45.0 %	15.386	<0.001
% White	86.2 %	78.3 %	2.595	0.107
% Low Incomeb	9.5 %	6.4 %	0.787	0.375
% Rx Stimulant	34.5 %	0 %	53.162	<0.001
Inatt. t-scorec	72.36 (11.50)	45.48 (8.36)	434.57	<0.001
Hyp. t-scorec	67.54 (13.48)	45.22 (7.38)	280.87	<0.001
Total t-scorec	71.49 (11.60)	44.96 (8.01)	432.13	<0.001
# Inatt. Symptomsd	6.53 (2.19)	0.39 (0.99)	823.72	<0.001
# Hyp. Symptomsd	5.11 (2.44)	0.46 (1.16)	372.89	<0.001
# ODD Symptomsd	1.41 (1.79)	0.29 (1.04)	35.84	<0.001

N=243

Abbreviations: ODD oppositional defiant disorder; Inatt. DSM-IV Inattentive domain; Hyp. DSM-IV Hyperactive/Impulsive domain

^aEstimated IQ from WISC-IV

^bReported family income below $25 k/year

^cFrom ADHD Rating Scale

^dFrom KSADS