表 3.
伴内听道狭窄、BCNC狭窄及闭锁的CNA患耳的PTA分布 耳
| PTA/ dB HL | 内听道狭窄 | BCNC狭窄 | BCNC闭锁 | BCNC狭窄+IAC狭窄 | BCNC闭锁+IAC狭窄 |
| 41~60 | 0 | 3 | 0 | 0 | 0 |
| 61~70 | 0 | 2 | 0 | 0 | 0 |
| 71~80 | 0 | 2 | 1 | 0 | 0 |
| >80 | 9 | 5 | 1 | 1 | 3 |
| 合计 | 9 | 12 | 2 | 1 | 3 |
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