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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Neuroimage. 2009 Jul 23;49(1):1133–1143. doi: 10.1016/j.neuroimage.2009.07.022

Table 1.

Mean and SEM for control and cannabis groups on demographic and drug use history.

Control (n=14) Cannabis (n=14)
Age 23.1 ± 1.2 22.1 ± 1.2
Years of Education 16.1 ± 0.4 17.1 ± 0.6
Verbal Intelligence Score (NART) 123.0 ± 0.8 123.9 ± 0.8
Beck Depression Inventory II Score 7.2 ± 2.1 8.1 ± 2.1
Females/Males 3/11 2/12
Years of Alcohol Use 6.9 ± 1.2 6.1 ± 1.2
Alcohol Use in Last Month (no. days) 7.8 ± 1.4 8.3 ± 1.8
Alcohol Use Age Onset (Years) 16.2 ± 0.5 15.6 ± 0.5
Years of Nicotine Use 7.9 ± 1.7 5.2 ± 1.3
Cigarettes/Day 10.0 ± 2.4 10.0 ± 2.8
Nicotine Use in Last Month (no. days) 15.0 ± 4.2 12.9 ± 4.1
Number of Packs in Last Month 11.8 ± 3.6 12.0 ± 3.8
Nicotine Use Age Onset (Years) 16.2.0 ± 0.6 16.4 ± 1.0
Amphetamine Use (no. times) 3.3 ± 1.2 3.0 ± 1.8
Amphetamine Use in Last Month (no. times) 0.0 ± 0.0 0.0 ± 0.0
Cocaine Use (no. times) 4.8 ± 0.3 6.1 ± 1.2
Cocaine Use in Last Month (no. times) 0.0 ± 0.0 0.0 ± 0.0
MDMA Use (no. times) 3.6 ± 0.9 4.5 ± 0.6
MDMA Use in Last Month (no. times) 0.0 ± 0.0 0.0 ± 0.0
Hallucinogenic Use (no. times) 2.0 ± 0.4 3.2 ± 0.4
Hallucinogenic Use in Last Month (no. times) 0.0 ± 0.0 0.0 ± 0.0
Cannabis Use (Years) 0.0 ± 0.0 6.1 ± 1.1
Life-time Joints (number) 3.0 ± 0.6 7258.6 ± 2512.8
Heavy Cannabis Use (Years) 0.0 ± 0.0 4.5 ± 1.1
Days of Use in Last Month (number) 0.0 ± 0.0 20.1 ± 2.5
Joints in Last Month (number) 0.0 ± 0.0 64.8 ± 10.7
Cannabis Use Age Onset (years) 17.0 ± 0.3 16.1 ± 0.4
Cannabis Abstinence (hours) 108.0 ± 39.7
11.6 ± 2.1
Cannabis Withdrawal Score (out of 32)
Cannabis Craving Scores (each item out of 21)
Compulsivity 5.9 ± 0.8
Emotionality 7.1 ± 1.2
Expectancy 10.6 ± 1.0
Purposefulness 12.1 ± 1.5