Prevalence of Alcohol and Marijuana Use by Demographic Characteristics (Percentages)

	Alcohol	No Alcohol	Marijuana	No Marijuana
Age	**		**
Cohort 9	12.93	87.07	4.59	91.41
Cohort 12	46.62	53.38	22.78	77.22
Cohort 15	75.00	25.00	33.47	66.53
Gender	N/S		*
Male	43.67	56.33	21.71	78.29
Female	42.15	57.85	17.15	82.85
Race	**		*
African American	36.57	63.43	21.20	78.80
Hispanic	43.58	56.42	16.44	83.56
Caucasian	57.81	42.19	24.61	75.39
Other	31.75	68.25	17.46	82.54

^**p ≤ .01

^*p ≤ .05