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Wisconsin Workers' Compensation Legal Library

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DWD 80.25 Loss of hearing. The department adopts the following
standards for the determination and evaluation of noise induced
hearing loss, other occupational hearing loss and accidental hearing
(1) Harmful noise. Hearing loss resulting from hazardous noise
exposure depends upon several factors, namely, the overall intensity
(sound pressure level), the daily exposure, the frequency
characteristic of the noise spectrum and the total lifetime exposure.
Noise exposure level of 90 decibels or more as measured on the A
scale of a sound level meter for 8 hours a day is considered to be
(2) Measurement of noise. Noise shall be measured with a sound level
meter which meets ANSI standard 1983 and shall be measured on the "A"
weighted network for "slow response." Noise levels reaching maxima at
intervals of one second or less shall be classified as being
continuous. The measurement of noise is primarily the function of
acoustical engineers and properly trained personnel. Noise should be
scientifically measured by properly trained individuals using
approved calibrated instruments which at the present time include
sound level meters, octave band analyzers and oscilloscopes, the
latter particularly for impact-type noises.
(3) Measure of hearing acuity. The use of pure tone air and bone
conduction audiometry performed under proper testing conditions is
recommended for establishing the hearing acuity of workers. The
audiometer should be one which meets the specifications of ANSI
standard 53.6-1969 (4). The audiometer should be periodically
calibrated. Preemployment records should include a satisfactory
personal and occupational history as they may pertain to hearing
status. Otological examination should be made where indicated.
(4) Formula for measuring hearing impairment. For the purpose of
determining the hearing impairment, pure tone air conduction
audiometry is used, measuring all frequencies between 500 and 6,000
Hz. This formula uses the average of the 4 speech frequencies of 500,
1,000, 2,000, and 3,000 Hz. Audiometric measurement for these 4
frequencies averaging 30 decibels or less on the ANSI calibration
does not constitute any practical hearing impairment. A table for
evaluating hearing impairment based upon the average readings of
these 4 frequencies follows below. No deduction is made for
(5) Diagnosis and evaluation. The diagnosis of occupational hearing
loss is based upon the occupational and medical history, the results
of the otological and audiometric examinations and their evaluation.
(6) Treatment. There is no known medical or surgical treatment for
improving or restoring hearing loss due to hazardous noise exposure.
Hearing loss will be improved in non-occupational settings with the
use of a hearing aid. Since a hearing aid relieves from the effect of
injury the cost is compensable where prescribed by a physician.
(7) Allowance for tinnitus. In addition to the above impairment, if
tinnitus has permanently resulted due to work exposure, an allowance
of 5% loss of hearing impairment for the affected ear or ears shall
be computed.
(8) Hearing impairment table. - See PDF for table PDF
(9) Method for determining percent of hearing impairment.
(a) Obtain for each ear the average hearing level in decibels at the
4 frequencies, 500, 1,000, 2,000 and 3,000 Hz.
(b) See Table for converting to percentage of hearing impairment in
each ear.
DWD 80.25(9)(c) (c) To determine the percentage of impairment for
both ears, multiply the lesser loss by 5, add the greater loss and
divide by 6. Following are examples of the calculation of hearing
loss: - See PDF for table PDF
1. Calculation of average hearing threshold level - See PDF for
diagram PDF:
2. Calculation of hearing handicap:
Smaller number (better ear)
8% 5 = 40
Larger number (poorer ear)
40% 1 = 40
Total 80 B 6 = 13.33% loss
Therefore, a person with the hearing threshold levels shown in this
audiogram would have a 13.33% hearing handicap. - See PDF for table PDF
1. Average hearing threshold level: - See PDF for diagram PDF
Therefore, the hearing loss is 4.8% left ear - See PDF for table PDF
1. Average hearing threshold level (use 93 db maximal value) - See
PDF for diagram PDF:
2. Hearing handicap:
Smaller number (better ear)
88% 5 = 440
Larger number (poorer ear)
100% 1 = 100%
Total 540 6 = 90% loss
Therefore, the hearing handicap is 90%.

History: 1-2-56; am. Register, January, 1960, No. 49, eff. 2-1-60;
am. Register, October, 1965, No. 118, eff. 11-1-65; r. and recr.
Register, September, 1972, No. 201, eff. 10-1-72; am. (1) to (4), r.
(5), renum. (6) and (7) to be (5) and (6), cr. (7) and am. (8),
Register, September, 1975, No. 237, eff. 10-1-75; am. (intro.), (2)
to (4), (6), (8) and (9), Register, September, 1986, No. 369, eff. 10-

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