Table 1.

Baseline sample descriptive statistics

Demographics	n	%
Gender: Female	13	40.6
Male	19	59.4
Ethnicity
European American	29	90.6
African American	2	6.3
Multi-racial	1	3.1
	Mean (SD)
Age	16.7 (1.1)
Socio-economic status	2.6 (1.2)
WASI IQ score	98.4 (12.6)
Frequency of substance use (past 6 months)
Alcohol use	3.2 (1.7)
Cannabis use	5.6 (2.6)
Tobacco use	6.1 (3.0)
	n	%
Current DSM-IV alcohol use disorder	15	46.9
Alcohol Abuse	11	34.4
Alcohol Dependence	4	12.5
Current DSM-IV cannabis use disorder	29	90.6
Cannabis Abuse	20	62.5
Cannabis Dependence	9	28.1
Current DSM-IV nicotine dependence diagnosis	10	31.3
Current DSM-IV “other drug” diagnosis1	14	43.8
Current DSM-IV psychopathology	n	%
Major depression	5	15.6
Conduct disorder	11	34.4
Attention deficit hyperactivity disorder	12	37.5
Oppositional defiant disorder	3	9.4

Notes: N=32. SD= standard deviation. Current=past 6 months. WASI= Wechsler Abbreviated Scale of Intelligence. Frequency of substance use: 0=never tried, 1=no use in past 6 months, 2=less than once per month, 3=once per month, 4=2–3 times per month, 5=once per week, 6=2–3 times per week, 7=4–6 times per week, 8=daily. “Other drug” refers to substances other than alcohol, cannabis or nicotine.

¹Among those with a current “other drug” diagnosis at baseline (n=14), the most common were related to opiates (n=10; 6=abuse, 4=dependence) and cocaine (n=6; 4=abuse, 2=dependence).