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Estimated potency versus measured potency of heroin and cocaine samples
| Estimated potency (%) | Measured potency (%) | Bias between measured and estimated potency (%) | |||||
|---|---|---|---|---|---|---|---|
| Mean | Median | Range | Mean | Median | Range | Median | |
| Heroin (n = 113) | 32.0 | 25.0 | 0–80 | 16.6 | 16.5 | 1.5–56.3 | + 83.4 |
| Cocaine (n = 74) | 34.8 | 26.3 | 0–90 | 50.5 | 50.1 | 8.0–91.6 | − 39.9 |
