|
Formula |
Frequencies
(Hz) |
Low
Fence (dB) |
High
Fence (dB) |
Better
Ear Ratio |
|
AAO
1979 |
500,
1000, 2000, 3000 |
25 |
92 |
5
: 1 |
|
AAOO
1959 |
500,
1000, 2000 |
25 |
92 |
5
: 1 |
NIOSH-FECA
1972 |
1000,
2000, 3000 |
25 |
92 |
5
: 1 |
NIOSH-1997
See About Calculator |
1000,
2000, 3000, 4000 |
25 |
92 |
5
: 1 |
British
Society
of Audiology |
500, 1000, 2000, 4000 |
25 |
92 |
5
: 1 |
Wisconsin
(CHABA*) |
1000,
2000, 3000 |
35 |
92 |
4
: 1 |
|
Oregon |
500,
1000, 2000, 4000, 6000 |
25 |
92 |
5
: 1 |
|
Ireland |
500, 1000, 2000, 4000 |
20 |
100 |
4 : 1 |
 To add additional equations or
report errors, please contact:
* CHABA: Committee on hearing,
bioacoustics, and biomechanics for the
National Academy of Sciences---National
Research Council.
Kevin Kavanagh Copyright
2003. All rights reserved. Webpage
last updated: 06/17/2024
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