Table 2. Grading system for the prevalence of olfactory neuroepithelium (ON) in each fragment.
| Grade | Percentage of ON in fragment |
|---|---|
| 0 | Absent |
| 1 | > 0% and ≤ 25% |
| 2 | > 25% and ≤50% |
| 3 | > 50% and ≤75% |
| 4 | > 75% and ≤100% |
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