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| Nasal endoscopy grading | Impedance audiometry | Total | |
|---|---|---|---|
| Normal | Abnormal | ||
| Grade 0 | 9 | 0 | 9 |
| Grade 1 | 44 | 4 | 48 |
| Grade 2A | 6 | 13 | 19 |
| Grade 2B | 0 | 12 | 12 |
| Grade 3A | 0 | 14 | 14 |
| Grade 3B | 0 | 4 | 4 |
| Total | 59 | 47 | 106 |
