Table 1.

Descriptive Statistics on Sample

	ADHD	Non-ADHD
	n = 61	n = 48
Age	4.49 (1.01)	4.15 (1.15)
Sex, n (% male)	40 (65.6)	24 (50)
Ethnic minority	27 (44.2)	9 (18.8)*
Income (mode; see below)	0	2,5
Parent-rated inattention	14.62 (7.17)	5.49 (5.52)**
Parent-rated hyperactive-  impulsive	18.08 (6.8)	6.82 (5.6)**
Teacher-rated inattention	19.04 (5.67)	4.05 (4.04)**
Teacher-rated hyperactive-  impulsive	17.48 (6.15)	4.96 (4.98)**
Negative affect	4.68 (0.93)	3.69 (0.81)**
Surgency	4.96 (1.02)	4.5 (0.84)*
Effortful control	4.69 (0.87)	5.07 (0.87)*
Reactive control	4.47 (1.4)	4.9 (1.2)
Neuroticism	3.63 (1.30)	3.36 (0.92)
Extraversion	6.38 (1.69)	6.64 (1.09)
Openness	5.76 (1.26)	6.03 (1.07)
Agreeableness	5.34 (1.42)	6.52 (0.73)**
Conscientiousness	5.07 (1.18)	5.81 (0.94)**

Note: Family income modes: 0 = annual income less than US$20,000; 1 = between US$20,000 and US$40,000; 2 = between US$40,000 and US$60,000; 3 = between US$60,000 and US$80,000; 4 = between US$80,000 and US$ 100,000; and 5 = more than US$100,000 annually.

^*p < .05.

^**p < .01 based on chi-square or ANOVA/MANOVA.