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The
Hearing
Impairment Calculator and
Master Calculator
can be used to determine the degree of hearing impairment present. Once the level of hearing
impairment has been determined, a table is used to identify the total body handicap
percentage. ** See Total Body Handicap Table ***
When evaluating cases of
occupational hearing loss, one must distinguish between Medical and Legal
Causation. Medical Causation calls for scientific certainty, but
Legal Causation only needs to be within a reasonable degree of medical
certainty. In some settings, only a more likely than not or greater than
50% likelihood is needed.
Presbycusis is hearing
loss associated with aging. In the medical-legal context, it is the
"non-occupational" hearing loss, or "nosocusis" as described
by Kryter in 1983, which the average individual of a
certain age has. Compensation for presbycusis
may be performed when
evaluating occupational hearing losses.
Go
To Presbycusis Calculator
Often workers have a
preexisting hearing loss when they begin employment. Many years later,
upon retirement, the hearing loss is worse and the question is raised: Is
the worker's hearing loss at retirement due to added occupational noise exposure,
or is it just the combination of the worker's pre-employment hearing loss and
other environmental factors. The
Age
Projection Calculator or
Master Calculator
can give guidance to this question. This
calculator can also be used to project the worker's post-employment audiogram
into the future and determine the likely hearing impairment at any given
age. (The Master Calculator and Age Projection Calculators will determine the degree of
presbycusis in the initial audiogram. Subtract these values from the presbycusis
for the projected age; then add the difference to the thresholds in the initial audiogram, thus,
calculating the projected audiogram. All projected thresholds are also
off-set by the ISO-1999 compression factor and truncated at 100 dB.)
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Master
Impairment and Projection Calculator
This calculator can use Robinson-Sutton's or Spoor's Presbycusis
Equations.
In addition, there are seven impairment formulas to choose from.
(AAO1979, AAOO1959, NIOSH1972, NIOSH1997, BSA, IRELAND, WISCONSIN,
OREGON)
View:
Formula
Definitions
More
About Presbycusis |
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Hearing
Impairment Calculators
(AAO 1979- Reference: JAMA 241:2055-2059,1979)
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Frequencies |
Low
Fence |
High
Fence |
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 |
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Presbycusis Calculator
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Robinson
Sutton Equations
(Reference: Robinson, DW and Sutton,
GJ. Audiology 18:320-334,1979.
As also described in Annex A of ISO 1999-01-15) |
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Spoor's
Equations:
(Spoor, A, Int.
Audiology 6:48-57,1967) |
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Age Projection of
Audiogram
(Noise induced hearing loss and presbycusis are assumed to be additive.
--Macrae, JH. Audiology. 10:323-333,1971.
All thresholds are off-set by ISO-1999 Compression Factor for
adding
presbycusis and noise induced hearing loss) |
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The maximum
recommended noise exposure, impairment, projection, presbycusis and
master calculators are meant for educational use. The user accepts
these web-based calculators "AS IS" without warranty of any kind. The
user also assumes all responsibility for the testing of the calculators
and any loss or liability caused directly or indirectly by the
calculators' use. Cumberland Otolaryngology Consultants, Dr. Kevin T. Kavanagh and/or their
employees, associates and/or stockholders assume
NO liability (direct, indirect or incidental) related to the calculators
operation. |
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and nose allergies, tonsil, adenoid and ear tube surgery, ear
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