Table 1.
Frequencies, means and standard deviations for demographic and drug use variables in the complete study sample
| Cocaine addicted (n = 20) | Healthy control (n = 20) | |
|---|---|---|
| Demographics | ||
| Gender (female/male) | 6/14 | 9/11 |
| Race (African American/Caucasian/Other) | 17/2/1 | 10/5/5 |
| M ± SD | M ± SD | |
|---|---|---|
| Age (Years)* | 42.0 ± 6.0 | 33.1 ± 6.4 |
| Education (Years) | 13.1 ± 1.4 | 14.1 ± 1.4 |
| Reading: Wide Range Achievement Test-Revised IIIa | 92.5 ± 13.7 | 92.9 ± 16.6 |
| Matrix Reasoning: Wechsler Abbreviated Scale of Intelligencea | 10.0 ± 3.9 | 10.2 ± 3.8 |
| Drug use | ||
| Number of cocaine use days in the past month | 17.4 ± 7.6 | — |
| Average grams per cocaine use occasion | 3.3 ± 2.1 | — |
| Length of abstinence from cocaine at time of study (number of days, averaged across all four study days) | 2.2 ± 1.3 | — |
| Age of onset of cocaine use (years) | 23.3 ± 6.1 | — |
| Duration of cocaine use (years) | 16.5 ± 6.4 | — |
| History of cigarette smoking (non-smoker/current smoker/former smoker)* | 2/17/1 | 11/7/2 |
M, mean; SD, standard deviation.
a
n = 39 (one control subject is missing data).
Independent t-tests (continuous variables) or chi-square tests (categorical variables) were conducted.
*
p < 0.01.