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. Author manuscript; available in PMC: 2014 Jul 25.
Published in final edited form as: Drug Alcohol Depend. 2011 Dec 27;123(0):249–254. doi: 10.1016/j.drugalcdep.2011.11.019

Table 1. Characteristics of Research Participants.

Control MA-Dependent
Sample size 42 36
Age 31.6 ± 9.0 32.5 ±7.6
Education (yrs.) 15.0 ± 2.1 12.8 ± 1.9
Mother's education (yrs.) 14.4 ± 3.2 13.3 ± 2.4
Ethnicity
 Caucasian 26 20
 African Am. 6 2
 Hispanic 2 9
 Asian/Pacific Islander 6 2
 Other 2 3
Gender
 Male 19 24
 Female 23 12
Years of frequent MA use -- 6.4 ± 6.5
Grams MA/week -- 3.8 ± 4.8
Days abstinent from MA at cognitive testing -- 7.5 ± 2.7
Days used marijuana In last 30 days 0.3 ±1.1 3.4 ± 6.9
Vocabulary score 31.4 ± 3.5 26.3 ± 5.5
Cognitive battery score .00 ± .54 −.65 ± .48

Note. Where appropriate, values are means ± SD. Vocabulary score = Shipley-Hartford Vocabulary test; Years of frequent MA use = years using MA at least 3 times per week, or twice weekly binges.