| Ei | risk level | RI | risk level |
| <40 | Low risk | <150 | Low risk |
| 40 - 80 | Moderate risk | 150 - 300 | Moderate risk |
| 80 - 160 | Considerable risk | 300 - 600 | Considerable risk |
| 160 - 320 | High risk | >600 | Extremely high risk |
| >320 | Extremely high risk |
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