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Example of five quantitative levels for characterizing the probability of occurrence of patient harm.
| Probability of occurrence of harm (Pharm) | Probability range (or Description)* |
|---|---|
| Improbable | Pharm < 0.01% |
| Remote | 0.01% ≤ Pharm < 0.1% |
| Occasional | 0.1% ≤ Pharm < 1% |
| Probable | 1% ≤ Pharm < 10% |
| Frequent | Pharm ≥ 10% |
*Depending on the specific application and availability of reliable data, either qualitative or quantitative levels can be used (24).
