Table 2.

Sample Characteristics for the Three Attention-Deficit/Hyperactivity Disorder (ADHD) Subtypes

	M (SD)
Variable	ADHD-PH (6)	ADHD-PI (18)	ADHD-C (20)
Age (years)	25.33 (2.58)	23.11 (4.71)	23.20 (4.77)
Education	14.67 (3.08)	13.21 (1.48)	12.94 (1.08)
Full scale IQ	109.33 (7.84)	115.57 (15.66)	109.79 (11.12)
WRAT reading	104.67 (7.34)	104.86 (11.30)	95.63 (13.3)
Conners’ (1)	63.25 (3.88)	68.12 (7.81)	69.82 (7.85)
Conners’ (2)	68.29 (6.65)	59.07 (8.39)	65.63 (7.32)

Note. ADHD-PH = primarily hyperactive/impulsive; ADHD-PI = primarily inattentive; ADHD-C = combined. Conners’ scores are t-scores; (1) is “cognitive problems,” which is closely related to Diagnostic and Statistical Manual for Mental Disorders, Fourth Edition (DSM–IV) inattentive symptoms; and (2) is hyperactive-impulsive symptoms. Values represent average of informant and self-report.