Table 2.
Audiological results of infants diagnosed with AN from first ABR to last audiological evaluation. Mean age (months) ± standard deviation at evaluation are reported for each test
| AN Patients n. | First ABR Right ear Left ear 3.69 ± 2.80 months | Second ABR Right ear Left ear 7.56 ± 2.87 months | Third ABR Right ear Left ear 11.83 ± 4.58 months | Fourth ABR Right ear Left ear 17.00 ± 2.83 months | Last audiological test 32.44 ± 17.58 months | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 70 dB | 50 dB | 70 dB | 40 dB | 40 dB | 40 dB | 30 dB | 30 dB | Normal |
| 2 | 50 dB | 30 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 3 | 30 dB | 50 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 4 | 40 dB | 70 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 5 | 40 dB | 80 dB | 30 dB | 40 dB | 30 dB | 30 dB | – | – | Normal |
| 6 | 40 dB | 30 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 7 | 50 dB | 30 dB | 50 dB | 30 dB | 30 dB | 30 dB | – | – | Normal |
| 8 | 40 dB | 50 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 9 | 40 dB | 30 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 10 | 50 dB | 30 dB | 40 dB | 40 dB | 30 dB | 30 dB | – | – | Normal |
| 11 | 50 dB | 70 dB | 70 dB | 70 dB | 30 dB | 30 dB | – | – | Normal |
| 12 | 50 dB | 40 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 13 | 40 dB | 30 dB | 50 dB | 40 dB | 50 dB | 70 dB | 40 dB | 30 dB | Normal |
| 14 | 50 dB | 30 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 15 | 30 dB | 50 dB | 30 dB | 30 dB | – | – | – | – | Normal |
| 16 | 40 dB | 30 dB | 30 dB | 30 dB | – | – | – | – | Normal |
AN Auditory neuropathy, ABR Auditory Brainstem Response, dB Decibel normal hearing level. Normal hearing thresholds are highlighted in bold characters