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. Author manuscript; available in PMC: 2016 Jul 22.
Published in final edited form as: Ear Hear. 2015 Jul-Aug;36(4):471–481. doi: 10.1097/AUD.0000000000000155

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