Table 5.

ADHD Subtype External Validation and Correlates

	Control	ADHD-Inattentive	ADHD-Combined
Mean (standard deviation)
Males (percent)	50.81	50.91	67.19
Age	11.95	12.35	10.81
Psychopathology
Anxiety/depression	2.80(2.90)a	4.32(3.54)b	5.03(3.97)b**
Withdrawal/depression	2.18(2.72)	2.62(2.55)	2.73(2.80)
Somatic complaints	1.41(2.1)a	2.66(2.66)b	2.67(3.19)b**
Social problems	1.87(2.52)a	2.89(2.67)b	4.92(3.59)c**
Rule-breaking	1.54(1.81)a	2.96(2.45)b	5.24(3.99)c**
Aggression	3.76(4.85)a	6.34(4.85)b	11.86(7.26)c**
Cognitive Control
Trails A Time	23.77(9.40)	26.58(10.66)	25.50(11.03)
Trails B Errors	.50(1.13)a	.61(.91)	.86(1.39)b**
SSRT	271.62(124.52)a	281.09(142.09)a	343.41(165.05)b**
RT variability	161.38(57.07)a	161.41(53.70)a	188.21(65.23)b**
Traits
Neuroticism	4.12(1.28)a	4.76(1.29)b	4.59(1.17)b**
Extraversion	5.56(1.31)a	5.54(1.41)a	6.42(1.30)b**
Agreeableness	6.49(1.23)a	6.31(1.16)a	5.53(1.31)b**
Conscientiousness	5.58(1.58)a	4.08(1.40)b	3.90(1.23)b
Effortful control	3.23(.71)a	2.86(.63)b	2.69(.69)b**
Reactive control	4.86(1.08)a	4.62(.97)a	3.68(.94)b**
Resiliency	5.93(.97)a	5.35(1.07)b	5.36(.98)b**
Negative emotion	4.03(1.33)a	4.53(1.30)b	4.72(1.20)b**

Note.

^*p<.05;

^**p<.01, via chi-square or MANOVA. Subscripts indicate significant differences, based on posthoc Tukey tests.