Table 3.

Description of alcohol and marijuana classes (n = 608)

	Non-use class (45.3%)	Moderate alcohol class (29.4%)	Moderate alcohol /increasing marijuana class (13.0%)	Dual use class (12.3%)
Gender (% male)	51.4	46.0	75.1	49.1
Ethnicity (% Black)	88.6	88.0	90.5	78.3
Intervention status (% in intervention condition)	69.4	68.6	54.0	72.7
Free/reduced priced school meals (%)	67.7	70.1	71.0	77.9
Academic performance (mean)	4.17	4.20	4.12	4.24
Aggressive/disruptive behavior (mean)	1.65	1.58	1.62	1.67
Attention/concentration problems (mean)	2.87	2.84	2.108	2.81
Impulsivity (mean)	2.25	2.32	2.28	2.39