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Groups descriptions.
| Ancestry | Heroin addiction (n; OD ± CD) |
Cocaine addiction (n; CD) |
Controls (n) | Total (n) |
|---|---|---|---|---|
| EA/ME | 824 (1) | – | 232 (4) | 1056 |
| AA | 314 (2) | 279 (3) | 206 (5) | 799 |
| Total | 1138 | 279 | 438 | 1855 |
Values provided are given as number of subjects. Numbers in parentheses are the group assigned numbers.
AA: African–American; CD: Cocaine dependence; EA/ME: European/Middle Eastern; OD: Opioid dependence.
