Table 2.

Descriptive statistics on child sample

	ADHD n = 302	Control n = 199	Total N = 548†
Males n(%)	204(67.5)	96(48.2)	321(58.6)**
Ethnic minority n(%)	78(25.8)	54(27.1)	144(26.3)
Age	11.3(2.9)	12.5(3.2)	11.7(3.1)**
Family income ($)	62643(67080)	75244(51109)	66694(59532)*
IQ	110.3(14.9)	103.8(13.9)	106.2(14.7)**
ADHD-C n(%)	192(63.6)	—	192(35)
ADHD-PI n(%)	110(36.4)	—	110(20.1)
ODD n(%)	118(39.1)	26(13.1)	161(29.4)**
CD n(%)	18(6)	1(.5)	19(3.5)**
MDD n(%)	28(9.3)	9(4.5)	41(7.5)
GAD n(%)	29(9.6)	11(5.5)	45(8.2)
Inattentive Sx	18(5)	3.2(3.4)	11.3(8.4)**
Hyperactive Sx	11(7.2)	2(2.2)	7.9(7.5)**

Note.

^*p < .05;

^**p < .01, via t-tests or chi-squares.

^†Forty-seven children-were identified as having situational ADHD or were screened out of the study at a later point in time, but were included in study analyses because they had diagnostic data.

ADHD-C = ADHD combined subtype. ADHD-PI = ADHD, predominantly inattentive subtype. ODD = oppositional defiant disorder. CD = conduct disorder. MDD = major depressive disorder, lifetime. GAD = generalized anxiety disorder, lifetime. Sx = symptoms.