Table 1.

Sample (N=150) descriptive statistics at baseline

Demographics	n	%
Male	112	74.7
Race/Ethnicity
White	125	83.3
Black	13	8.7
Multi-racial	12	8.0
Mandated to treatment by court	55	36.7

	n	Mean (SD)
Age (range: 14–18)	150	16.9 (1.1)
Socio-economic status (1=high, 5=low)	150	2.5 (1.1)

Pre-treatment measures	n	%
Marijuana abstinence goal
Abstinence or Abstinence, but slip possible	102	70.8
Non-abstinence goal	42	29.2

	n	Mean (SD)
Perceived peer marijuana use	149	3.8 (1.0)

Frequency of use (past 6 months)	n	Mean (SD)
Marijuana	150	5.1 (2.6)
Alcohol	150	2.8 (1.8)

Past Year DSM-IV diagnosis	n	%
Marijuana use disorder	138	92.0
Marijuana abuse	111	74.0
Marijuana dependence	27	18.0
Alcohol use disorder	50	33.4
Alcohol abuse	46	30.7
Alcohol dependence	4	2.7

Past Year DSM-IV symptom count	n	Mean (SD)
Marijuana symptom count	150	3.7 (2.1)
Alcohol symptom count	150	1.1 (1.5)

Note: Frequency of use (past 6 months): 0=no lifetime use, 1=no use in the 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, and 8=daily use.