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| Grade | Features |
|---|---|
| Grade 0 | No signs or symptoms |
| Grade 1 | Euphoria, anxiety, trivial lack of awareness, impaired performance, shortened attention span, mild asterixis |
| Grade 2 | Lethargy, minimal personality changes, subtle personality change, inappropriate behavior, asterixis |
| Grade 3 | Somnolence, confusion, gross disorientation |
| Grade 4 | Coma |
