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Firefighters' hearing: a comparison with population databases from the International Standards Organization.

S N Kales1, R L Freyman, J M Hill

  • 1Cambridge Health Alliance, Cambridge, MA, USA. stefokali@aol.com

Journal of Occupational and Environmental Medicine
|July 24, 2001
PubMed
Summary

Firefighters experience accelerated hearing loss beyond age-expected levels, particularly at higher frequencies and percentiles. This occupational hazard significantly impacts hearing health in this demographic.

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Area of Science:

  • Occupational Health
  • Audiology
  • Environmental Health

Background:

  • Firefighters are exposed to high noise levels, posing a risk to hearing.
  • General population hearing data requires adjustment for occupational noise exposure.
  • Understanding age-related hearing changes is crucial for assessing occupational hearing loss.

Purpose of the Study:

  • To quantify excess hearing loss in male firefighters compared to age-expected normative data.
  • To investigate hearing threshold differences at various frequencies and percentiles.
  • To establish the impact of occupational noise exposure on firefighter hearing.

Main Methods:

  • Comparison of hearing thresholds of five male firefighter groups with increasing mean ages.
  • Utilized normative hearing data from International Standards Organization databases A and B.
  • Analyzed hearing thresholds at the 50th and 90th percentiles across different frequencies (2000-6000 Hz).

Main Results:

  • Firefighters showed significant excess hearing loss at 3000, 4000, and 6000 Hz (50th percentile).
  • Greater excess hearing loss was observed at the 90th percentile, especially at 3000, 4000, and 6000 Hz.
  • Hearing loss accelerated beyond age-expected levels, particularly in higher frequency ranges.

Conclusions:

  • Firefighter occupation is associated with accelerated hearing loss exceeding age-related changes.
  • Noise exposure in firefighting significantly contributes to hearing impairment.
  • Hearing conservation programs are critical for protecting firefighters' auditory health.