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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...

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Hearing threshold comparisons between 2001-02 NHANES and 2003-05 Fort Bliss U.S. Army Service components.

Josef A Sobieraj1, Shawn G Gibbs, Heath Steele

  • 1William Beaumont Army Medical Center, Department of Preventive Medicine, 5005 N. Piedras St., El Paso, TX 79920-5001, USA.

Military Medicine
|February 17, 2009
PubMed
Summary

Military and civilian males show similar hearing thresholds, unlike past findings. Active Duty males under 40 have better hearing than National Guard males.

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Area of Science:

  • Audiology
  • Occupational Health

Background:

  • Hearing loss is a significant concern in military populations.
  • Previous studies indicated higher hearing thresholds in military personnel compared to civilians.

Purpose of the Study:

  • To compare hearing threshold levels at 4 kHz between military components and a civilian population.
  • To examine gender differences in hearing thresholds across these groups.

Main Methods:

  • Analysis of 4 kHz hearing threshold data from the National Health and Nutrition Examination Survey (NHANES) and Fort Bliss Army components (Active Duty, National Guard, Reserve).
  • Statistical comparison of mean hearing thresholds by military status and gender.

Main Results:

  • No significant difference in mean hearing thresholds at 4 kHz between U.S. Army Active Duty males and NHANES males.
  • Active Duty males under 40 years old demonstrated significantly lower hearing thresholds than National Guard males.
  • Female groups exhibited significantly lower hearing thresholds than male groups across all ages, with no significant differences between military and civilian females.

Conclusions:

  • Recent U.S. Army Active Duty males do not show elevated hearing thresholds compared to the general male population, contrasting with historical data.
  • Younger Active Duty males may have better hearing preservation than their National Guard counterparts.
  • Gender is a significant factor in hearing thresholds, with females generally having better hearing than males.