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High-frequency audiometry: test reliability and procedural considerations.

P G Stelmachowicz1, K A Beauchaine, A Kalberer

  • 1Boys Town National Institute for Communication Disorders in Children, Omaha, Nebraska 68131.

The Journal of the Acoustical Society of America
|February 1, 1989
PubMed
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This study found that a new high-frequency audiometer (HFA) offers individual calibration for hearing tests. However, its reliability decreases above 11 kHz compared to a simpler system due to calibration complexities.

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Science

Background:

  • High-frequency hearing loss assessment is crucial.
  • Existing audiometric systems have limitations in high-frequency range.
  • Individualized calibration can improve threshold accuracy.

Purpose of the Study:

  • Compare the reliability of a new high-frequency audiometer (HFA) with a standard Koss system.
  • Evaluate factors affecting HFA reliability, including calibration and fitting.
  • Determine the feasibility of expressing high-frequency thresholds in dB SPL.

Main Methods:

  • Recruited 50 normal-hearing subjects aged 10-60 years.
  • Assessed hearing thresholds using both HFA and Koss systems.
  • Analyzed threshold variance, earpiece fitting variance, and HFA calibration variance.

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Main Results:

  • Both systems showed similar reliability without earpiece replacement.
  • HFA demonstrated poorer reliability above 11 kHz with earpiece replacement.
  • HFA reliability improved with valid calibration functions across the frequency range.
  • Koss system data conversion to dB SPL using average factors lacked individual accuracy.

Conclusions:

  • The HFA's benefit of dB SPL threshold expression must be balanced against calibration variability.
  • The Koss system may be more reliable above 11 kHz when earpiece replacement occurs.
  • Accurate high-frequency audiometry requires careful consideration of calibration methods and potential error sources.