Subject Characteristics
| Characteristic | Data |
|---|---|
| Number of subjects (n) | 79 |
| Male/female (n) | 33/46 |
| Age (y) | |
| Mean ± SD | 22.0 ± 3.5 |
| Range | 18–35 |
| BPND (mean ± SD) | |
| Striatum | 11.3 ± 2.7 |
| Caudate nucleus | 12.2 ± 2.9 |
| Putamen | 10.3 ± 2.5 |
| VNTR (n) | |
| 9R/9R | 5 |
| 9R/10R | 27 |
| 10R/10R | 45 |
| rs2652511 (n) | |
| CC | 29 |
| CT | 35 |
| TT | 13 |
| rs2937639 (n) | |
| GG | 28 |
| AG | 36 |
| AA | 13 |
| Substance use (mean ± SD) | |
| Alcohol (units/wk) | 8.7 ± 9.2 |
| Tobacco (cigarettes/wk) | 32.5 ± 55.6 |
| Cannabis (joints last year) | 37.1 ± 89.2 |
| Amphetamine (times last year) | 0.1 ± 0.7 |
| Cocaine (times last year) | 0.4 ± 1.5 |