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. Author manuscript; available in PMC: 2016 Nov 17.
Published in final edited form as: Exp Clin Psychopharmacol. 2011 Jun;19(3):224–230. doi: 10.1037/a0023030

Table 1. Subject demographic and drug use variables.

Participant Demographics and Drug Use Variables by Group and Gender

Cannabis Group Control Group
Males (n=8) Mean (SD) Females (n=8) Mean (SD) Gender Contrasts Males (n=8) Mean (SD) Females (n=8) Mean (SD) Gender Contrasts Group Contrasts
Years of Education 13.63 (2.83) 12.88 (1.36) ns 14.75 (2.71) 12.88 (1.36) ns ns
Age at Study (years) 27.25 (5.50) 28.50 (4.14) ns 27.25 (5.18) 27.88 (5.14) ns ns
Age at First Use of Marijuana (years) 16.38 (2.50) 16.75 (3.20) ns N/A N/A -- --
Duration of Daily Marijuana Use (months) 79.50 (66.64) 81.00 (58.35) ns 0 (0) 0 (0) ns < .001
Current Daily Use (# blunts/day) 2.88 (1.46) 2.75 (1.34) ns 0 (0) 0 (0) ns < .001
Estimated Lifetime Episodes of Marijuana Use 11659.00 (1329.71) 9193.00 (5959.63) ns 0 (0) 0 (0) ns < .001
Episodes of MDMA Use 1.00 (2.45) 4.38 (12.37) ns 0 (0) 0 (0) ns ns
Episodes of Cocaine Use 0 (0) 6.25 (13.50) ns 0 (0) 0 (0) ns ns

Note: Group and Gender contrasts were tested by one-way ANOVAs.