1 / 5

Richard H. Wilson, PhD; Rachel McArdle, PhD

Characteristics of audiometric 4,000 Hz notch (744,553 veterans) and 3,000, 4,000, and 6,000 Hz notches (539,932 veterans). Richard H. Wilson, PhD; Rachel McArdle, PhD. Aim Examine prevalence and characteristics of audiograms notched at 4,000 Hz and at 3,000, 4,000, and/or 6,000 Hz.

apetersen
Télécharger la présentation

Richard H. Wilson, PhD; Rachel McArdle, PhD

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Characteristics of audiometric 4,000 Hz notch (744,553 veterans) and3,000, 4,000, and 6,000 Hz notches (539,932 veterans) Richard H. Wilson, PhD; Rachel McArdle, PhD

  2. Aim • Examine prevalence and characteristics of audiograms notched at 4,000 Hz and at 3,000, 4,000, and/or 6,000 Hz. • Extend findings from previous local group of veterans to substantially larger national group of veterans. • Relevance • Air-conduction audiograms with 3,000, 4,000, and/or 6,000 Hz thresholds at higher hearing levels than adjacent 2,000 and 8,000 Hz thresholds are known as “notched audiograms.”

  3. Method • Bilateral audiograms from ~1 million veterans were obtained from Department of Veterans Affairs archives. • After “cleaning” algorithms, 2 analysis groups formed: • Group 1 (4,000 Hz notch analysis) • 744,553 participants (mean age 63.5 yr). • Group 2 (3,000, 4,000, and/or 6,000 Hz notch analysis) • 539,932 participants (mean age 62.2 yr).

  4. Results • Group 1: • 77.1% did not have 4,000 Hz notch. • Group 2: • 65.3% did not have 3,000, 4,000, or 6,000 Hz notch. • 12.4% had bilateral notches. • Left vs right ear: • 11.7% had left ear notches. • 10.7% had right ear notches. • Low vs high frequency: • Notches about twice as deep on low-frequency side of notch than high-frequency side. • Notch depth about same (23 dB) in both ears.

  5. Conclusion • Finding of more unilateral than bilateral notches prompts at least two hypotheses: • High-frequency notches are caused by multiple factors, including excessive noise exposure. • The ears are differentially sensitive to whatever factors are eventually found to be responsible for high-frequency audiometric notches.

More Related