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Abnormal Audiogram Risk Factors in Military Aircrew and Ground-Based Aviation Personnel.

Benjamin Zhi Qiang Seah, Wee Tong Ng, Wee Hoe Gan

    Aerospace Medicine and Human Performance
    |July 11, 2025
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    Summary

    Military aviation personnel face noise hazards, with 4.6% showing abnormal audiograms. Age and specific vocations like Air Force Engineer are key risk factors for hearing loss.

    Keywords:
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    Area of Science:

    • Occupational Health
    • Aerospace Medicine
    • Audiology

    Background:

    • Military aviation environments present significant occupational noise hazards.
    • High auditory acuity is critical for safe flight operations.
    • Understanding hearing health in aviation personnel is crucial.

    Purpose of the Study:

    • To determine the prevalence, characteristics, and severity of abnormal audiograms in Republic of Singapore Air Force aviation personnel.
    • To identify risk factors associated with abnormal audiograms in this population.

    Main Methods:

    • A cross-sectional study analyzed anonymized data from annual certification examinations in 2022.
    • Pure tone audiometry, sociodemographic, anthropometric, physiological, and biochemical data were included.
    • Multivariable logistic regression identified significant risk factors for abnormal audiograms.

    Main Results:

    • 4.6% of 1817 audiograms were abnormal, showing noise-induced hearing loss patterns.
    • Age and specific vocations (Communication Equipment Specialist, Air Force Engineer, Air Warfare Officer, Unmanned Aerial Vehicle Pilot) were significant risk factors.
    • Aircraft platforms and engine types were not associated with increased risk.

    Conclusions:

    • Modified World Health Organization criteria can identify at-risk subgroups in military aircrew.
    • These criteria may serve as a sensitive screening threshold for early noise-induced hearing loss.
    • Targeted interventions for identified risk factors are recommended.