| Potential consequences | |||||
| Likelihood of reoccurrence | Death | Severe | Moderate | Minor | Insignificant |
| Within several hours to days | 4 | 4 | 3 | 2 | 2 |
| Within several weeks | 4 | 4 | 3 | 2 | 2 |
| Within several months | 4 | 3 | 3 | 2 | 1 |
| Once in 1–5 years | 4 | 3 | 2 | 1 | 1 |
| Less than once in 5 years | 3 | 2 | 2 | 1 | 1 |
*Consensus was provided by an interdisciplinary NEOSAFE meeting; 4 = extreme risk, 3 = major risk, 2 = moderate risk, 1 = minor risk.