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. Author manuscript; available in PMC: 2013 May 27.
Published in final edited form as: J Psychopharmacol. 2012 May 13;26(10):1289–1298. doi: 10.1177/0269881112446530

Table 1.

Participants' Demographics and Past-Month Drug Use.

Mean SD Range
Age (years) 24.36 4.56 18–35
Body mass index 22.45 2.04 19–26
Education (years) 15.48 1.45 12–18
Caffeine (cups/day) 1.64 1.08 0–5
Alcohol (drinks/week) 7.12 4.20 0–14
Cannabis (times/month) 2.12 2.54 0–8