Table 3.

Duration and Impairment of 12-Month DSM-IV/CIDI Intermittent Explosive Disorder Among 6483 Adolescents in the NCS-A

	Narrowly Defineda (n = 216)	Intermediately Defined–Onlya (n = 72)	Broadly Defined–Onlya (n = 97)	Broadly Defineda (n = 385)	${\chi }_2^2$ b
12-mo Persistence, mean (SE)
No. of 12-mo attacks	18.3 (4.8)	1.6 (0.1)	2.5 (0.4)	10.4 (2.5)	68.8c
No. of weeks with attacks	8.3 (1.0)	1.5 (0.1)	2.0 (0.3)	5.3 (0.5)	62.0c
Severe role impairment (Sheehan Disability Scales), % (SE)
Home	4.8 (1.9)	5.7 (4.1)	4.3 (3.5)	4.8 (1.9)	0.1
Work	7.4 (2.3)	9.8 (5.9)	3.5 (2.2)	6.8 (1.7)	1.6
Interpersonal	14.6 (2.6)	22.5 (6.6)	6.5 (4.2)	14.0 (2.7)	3.2
Social	16.5 (5.0)	5.4 (2.9)	1.4 (0.9)	10.0 (2.9)	14.8c
Summary	31.3 (4.6)	27.9 (7.0)	13.2 (5.8)	25.6 (3.8)	4.6

Abbreviations: CIDI, Composite International Diagnostic Interview; NCS-A, National Comorbidity Survey Replication Adolescent Supplement.

^aNarrowly defined, 3 or more 12-mo attacks involving physical assault or property damage; intermediately defined–only, 3 or more lifetime attacks in a single year (lifetime narrow) and either one or two 12-mo attacks, or 3 + 12-mo attacks but attacks only involved threatening someone; broadly defined–only, 3 or more lifetime attacks without ever having more than 3 in a single year (lifetime broad), and having one or two 12-mo attacks; broadly defined (includes all intermittent explosive disorder cases), narrowly defined or intermediately defined–only or broadly defined–only.

^bNarrowly defined vs intermediately defined–only vs broadly defined–only. The top 2 rows (number of 12-mo attacks, number of weeks with attacks) are continuous variables, and a bivariate linear regression model was used to assess the differences across subsamples. The final 5 rows are dichotomous variables, and a bivariate logistic regression model was used to assess the differences across subsamples. No controls were used in these models.

^cSignificant difference at P < .05, 2-sided test.