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Hearing loss according to tympanic membrane involvement, i.e. area occupied by perforation (n = 64)
| Size of perforation (mm2) | % of TM involved by perforation | No. of ears | Average hearing loss (dB) |
|---|---|---|---|
| 1–14 | <25 | 6 | 28.23 |
| 15–27 | 25–50 | 28 | 32.42 |
| 28–41 | 50–75 | 9 | 36.26 |
| 42–55 | 75–100 | 21 | 44.62 |
