Table 1.
Data-driven Cantu4 grading system for concussion
| Grade 1 (mild) |
| No loss of consciousness; post-traumatic amnesia* or post-concussion signs or symptoms lasting less than 30 minutes |
| Grade 2 (moderate) |
| Loss of consciousness lasting less than 1 minute; Post-traumatic amnesia* or post-concussion signs or symptoms lasting longer than 30 minutes but less than 24 hours |
| Grade 3 (severe) |
| Loss of consciousness lasting more than 1 minute or post-traumatic amnesia* lasting longer than 24 hours; Post-concussion signs or symptoms lasting longer than 7 days |
*
Retrograde and anterograde