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The Classification of Adverse Events
| Classification | Features |
|---|---|
| Certain | Event with appropriate time course |
| No other explanation | |
| Consistent definitive signs | |
| Probable | Reasonable time relationship |
| Unlikely to be caused by something else | |
| Possible | No other reasonable explanation |
| Reasonable time relationship | |
| Unlikely | No reasonable time relationship |
| Other plausible explanations | |
| Unknown | Insufficient data |
| Cannot be verified |
