Go to Table F-1 and find the age correction values (in dB) for 4000 Hz at age 27 and age 32. The contribution of aging to this change in hearing may be estimated in the following manner: A retest audiogram has confirmed this shift. (The threshold shift is computed by subtracting the hearing threshold at age 27, which was 5, from the hearing threshold at age 32, which is 25). A threshold shift of 20 dB exists at 4000 Hz between the audiograms taken at ages 27 and 32. Asterisks have been used to identify the baseline and most recent audiogram. The audiogram at age 27 is considered the baseline since it shows the best hearing threshold levels. The audiometric history for his right ear is shown in decibels below.Įmployee's age _ (iii) The differences calculated in step (ii) represented that portion of the change in hearing that may be due to aging.ĮXAMPLE: Employee is a 32-year-old male. (ii) Subtract the values found in step (i)(B) from the value found in step (i)(A).
(B) Finding the age at which the baseline audiogram was taken and recording the corresponding values of age corrections at 1000 Hz through 6000 Hz.
(A) Finding the age at which the most recent audiogram was taken and recording the corresponding values of age corrections at 1000 Hz through 6000 Hz (i) Determine from Tables F-1 or F-2 the age correction values for the employee by: Occupational Exposure to Noise," ((HSM)-11001). This procedure and the age correction tables were developed by the National Institute for Occupational Safety and Health in the criteria document entitled "Criteria for a Recommended Standard. If the employer chooses to adjust the audiogram, the employer shall follow the procedure described below. In determining whether a standard threshold shift has occurred, allowance may be made for the contribution of aging to the change in hearing level by adjusting the most recent audiogram.
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