Table 1. Sample Characteristics.
| Condition | 0 mg (n = 27) |
30 mg IR (n = 30) |
30 mg SR (n = 25) |
|---|---|---|---|
| Demographic | |||
| Age (Years) | 36.8 (6.3) | 35.9 (5.1) | 36.5 (6.5) |
| %Female | 22.2 (11) | 10.0 (9) | 12.0 (8) |
| Education (Years) | 12.8 (1.7) | 13.3 (2.8) | 12.1 (2.2) |
| %Race | |||
| White | 25.9 (7) | 23.3 (7) | 36.0 (9) |
| Black | 70.4 (19) | 60.0 (18) | 48.0 (12) |
| Hispanic | 3.7 (1) | 16.7 (5) | 16.0 (4) |
| %Married | 14.8 (10) | 20.0 (12) | 16.0 (9) |
| %Employed | 70.4 (13) | 73.3 (13) | 60.0 (13) |
| Drug Use | |||
| %Intake Cocainea | 73.1 (20) | 69.0 (17) | 70.8 (21) |
| %Crack Cocaineb | 70.4 (19) | 70.0 (21) | 72.0 (18) |
| Cocaine Use (30 days) | 11.7 (9.1) | 12.3 (9.0) | 11.0 (5.8) |
| Cocaine (Years) | 10.5 (6.2) | 10.1 (6) | 9.6 (5) |
| Alcohol (Years) | 12.1 (9.3) | 14.6 (10.7) | 15.3 (8.9) |
| Marijuana (Years) | 12.6 (8.9) | 9.8 (7.3) | 8.5 (9) |
| ASI Composite Scores | |||
| Medical | 0.09 (0.19) | 0.02 (0.08) | 0.02 (0.07) |
| Employment | 0.56 (0.29) | 0.47 (0.29) | 0.56 (0.27) |
| Alcohol | 0.12 (0.16) | 0.21 (0.20) | 0.15 (0.15) |
| Drug | 0.23 (0.07) | 0.24 (0.09) | 0.23 (0.06) |
| Legal | 0.02 (0.06) | 0.06 (0.12) | 0.06 (0.16) |
| Family/Social | 0.17 (0.23) | 0.10 (0.18) | 0.19 (0.21) |
| Psychiatric | 0.03 (0.08) | 0.07 (0.13) | 0.08 (0.12) |
Note. No significant differences were observed among conditions on any variable. For continuous variables, mean values are reported with standard deviations in parentheses while for categorical variables, percentages are reported with subsample sizes in parentheses.
a
% positive for cocaine use at intake based on urine benzoylecgonine test.
b
% of individuals who were primarily crack cocaine users.