Table 1.

Descriptive Statistics

	ADHD (n = 27)	Word Reading-matched Controls (n= 27)
Group Defining Variables
ADHD Symptoms	11.89 (3.53)	1.26*** (1.79)
Inattention	7.41 (1.60)	.89*** (1.31)
Hyp/Imp	4.48 (3.23)	.37*** (.97)
Word Reading z-score	−.64 (.91)	-.68 (.93)
Demographics
Age	9.78 (.35)	9.89 (.55)
Gender (% female)	33.3	81.5***
Father’s education (years)	14.69 (2.45)	15.67 (2.43)
Mother’s education (years)	14.78 (2.49)	15.04 (2.41)
Ethnicity (% Caucasian)	90.0	96.3
Comorbid Diagnosis (% diagnosed)
Oppositional Defiant Disorder	48.1	3.7***
Conduct Disorder	28.0	3.7*
Generalized Anxiety Disorder	15.4	7.7
Major Depression	18.5	7.4
Cognitive Variables
Inhibition	−.39 (1.10)	.26* (.91)
Verbal Processing Speed	−.35 (.61)	.00 (.77)
Motor Processing Speed	−.29 (.55)	.08 (.67)
Working Memory	−.31 (.59)	.00 (.78)
Full Scale IQ	105.78(8.79)	106.96 (11.36)
Verbal IQ	108.96 (11.45)	110.00 (13.83)
Performance IQ	101.22 (10.14)	102.56 (9.69)

Note. Asterisks indicate the statistical significance of group differences:

^*p < .05,

^**p < .01,

^***p < .001. Except where noted, means (with standard deviations) are presented.