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| Variable | Category | Frequency | percent |
|---|---|---|---|
| Family history | Positive | 10 | 59 |
| Negative | 7 | 41 | |
| Substance history | Smoking | 8 | 47 |
| Opium | 6 | 35 | |
| Hashish | 5 | 29 | |
| Methamphetamines | 5 | 29 | |
| Methadone | 5 | 29 | |
| Tramadol | 4 | 24 | |
| Heroin | 3 | 18 | |
| Crack | 2 | 12 | |
| Buprenorphine | 2 | 12 | |
| Benzodiazepines | 2 | 12 | |
| MDMA | 1 | 6 | |
| Nothing | 5 | 29 | |
| Medical history | Head trauma | 5 | 29 |
| Seizure | 5 | 29 | |
| Hypothyroidism | 2 | 12 | |
| Mitral valve prolapse | 2 | 12 | |
| Hepatitis C | 1 | 6 | |
| Urinary tract infection | 1 | 6 | |
| Nothing | 4 | 24 |
