Table 1.

Demographic information for incarcerated male adolescents (N = 269).

Variable	N	Min	Max	Mean	SD	95% C.I.
Age	269	13.75	20.75	17.25	1.22	17.11–17.39
IQ	269	57	140	90.51	13.52	88.91–92.19
Callous-unemotional traits
ICU total	269	7	65	28.51	9.59	27.41–29.72
ICU callous	269	0	24	7	4.13	6.53–7.53
ICU uncaring	269	0	22	10.34	4.96	9.75–10.95
ICU unemotional	269	0	15	8.61	3.06	8.27–9.00
Substance use history
Cumulative substance usea	269	0	215.57	52.04	35.35	47.77–56.31

Variable				n	%
Race
American Indian				30	11
Black				58	22
Pacific Islander				1	1
White				53	20
Other/decline				124	46
Missing				3	1
Ethnicity
Hispanic				155	58
Not Hispanic				114	42
Location
Wisconsin				80	30
New Mexico				189	70
Handedness
Right				208	77
Left				26	10
Ambidextrous				2	1
Missing				33	12

^aCumulative Substance Use was calculated by adding years of regular use (three times a week or more) for all substances, dividing by age, multiplied by 100, and a square root transformation was applied to correct for skew.