Table 3 Heroin and cocaine self-reported use compared to hair sample test results
From: A follow-up study of heroin addicts (VEdeTTE2): study design and protocol
| Â | Biological sample | |||
|---|---|---|---|---|
| Â | Heroin | Cocaine | ||
Self-reported drug use in the last 30 days | Positive | Negative | Positive | Negative |
yes | 14 | 2 | 9 | 0 |
no | 4 | 11 | 12 | 10 |
Total agreement | 80.7% | 61.3% | ||
Sensitivity | 77.8% | 42.9% | ||
Specificity | 84.6% | 100% | ||