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| Information | Non-drug users (n = 16) | Chronic heroin users (n = 16) |
| Age (years) | 37.3±6.9 | 36.7±7.1 |
| Education (years) | 8.7±2.1 | 8.4±1.6 |
| Duration of heroin use (months) | N/A | 85.3±46.2 |
| Dosage of heroin use (g/day) | N/A | 0.6±0.3 |
| Duration of abstinence from heroin(months) | N/A | 4.7±0.7 |
| Average methadone use (mg/day) | N/A | 34.6±18.1 |
