Table 2.
Air conduction (AC) and bone conduction (BC) thresholds (dB nHL), and air bone gap (ABG) in dB for toneburst wave V thresholds. The number of ears tested varied with frequencies. The 95th percentile was extrapolated from cumulative distribution graphs to the nearest 5 dB value between adjacent levels at 10 dB increments.
| Frequency (Hz) | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|
| Mean AC | 17.2 | 12.3 | 7.3 | 7.0 |
| Median AC | 20 | 10 | 0 | 10 |
| 95th percentile AC | 35 | 30 | 25 | 20 |
| No of ears | 86 | 144 | 93 | 154 |
| Mean BC | 14.4 | 14.0 | 12.9 | 17.7 |
| Median BC | 10 | 10 | 10 | 10 |
| 95th percentile BC | 30 | 30 | 25 | 35 |
| No of ears | 64 | 117 | 62 | 115 |
| Mean ABG | 2.36 | 1.71 | −1.38 | −6.88 |
| Median ABG | 0 | 0 | 0 | 0 |
| 95th percentile ABG | 20 | 20 | 0 | 10 |