Table 1.

Participant Demographic and Drug Use Summary (n=33).

Age (years) Mean ± SD	23.45 ± 4.6
Weight (lbs: mean ± SD)	150.6 ± 20.9
Sex (n; male/ female)	18 (55%) / 15 (45%)
Race/Ethnicity
Caucasian	23 (70%)
African-American	4 (12%)
Asian/ Native American	5 (15%) /1 (3%)
Education (n)
High school	1 (3%)
Some college	19 (58%)
College degree	13 (39%)
Full time student	23 (70%)
Current drug use
Alcohol (mean ± SD; drinks/week)	6.2 ± 5.0
Caffeine (mean ± SD; drinks/week)	8.3 ± 7.4
Cigarettes (mean ± SD; cigarettes/day)
Nonsmokers (n=22)	0
Smokers (n=11)	10.7 ± 3.4
Marijuana (n: >0.5 cigarettes/week)	5 (15%)
Lifetime recreational drug use
Stimulants (n: ever used)	13 (40%)
Tranquilizers (n: ever used)	1 (3%)
Hallucinogens (n: ever used)	11 (33%)
Opiates (n: ever used)	4 (12%)
Marijuana
Never used (n)	5 (15%)
Used < 10 times (n)	11 (33%)
Used 10–50 times (n)	9 (27%)
Used > 50 times (n)	8 (24%)
Inhalants (n: ever used)	5 (15%)