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Hearing damage in military service. A study on 38,294 conscripts.

I Klockhoff, L Lyttkens, A Svedberg

    Scandinavian Audiology
    |January 1, 1986
    PubMed
    Summary

    Noise exposure during military training caused high-frequency hearing loss in 5% of conscripts. Pre-existing hearing defects increased the risk of further deterioration, highlighting the need for pre-enlistment hearing assessments.

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    Area of Science:

    • Audiology
    • Occupational Health
    • Military Medicine

    Background:

    • Noise-induced hearing loss is a significant occupational hazard.
    • High-frequency hearing defects are common in young adults.
    • Military basic training involves prolonged exposure to noise.

    Purpose of the Study:

    • To investigate the incidence and characteristics of noise-induced high-frequency hearing deterioration in conscripts during basic training.
    • To assess the impact of pre-existing hearing status on the risk of developing noise-induced hearing deterioration.
    • To evaluate the implications of hearing data for conscript assignment to noisy environments.

    Main Methods:

    • Audiometric assessment of 38,294 conscripts before and after basic training (mean 245 days).
    • Analysis of high-frequency hearing deterioration, its laterality, and symptomatic levels.
    • Correlation analysis between initial hearing status and subsequent hearing changes.

    Main Results:

    • 29% of conscripts had pre-existing high-frequency hearing defects.
    • 5% developed high-frequency hearing deterioration post-training, often unilateral or asymmetrical.
    • 0.5% experienced symptomatic hearing loss, with 0.03% meeting criteria for 10% hearing disability.
    • Conscripts with pre-existing hearing loss had a significantly higher incidence (17%) of deterioration compared to those with normal hearing (3%).

    Conclusions:

    • Military basic training can lead to significant high-frequency hearing deterioration.
    • Pre-existing sensorineural hearing loss is a risk factor for noise-induced hearing deterioration.
    • Pre-enlistment audiometric screening is crucial for assigning conscripts to appropriate training and posts to mitigate hearing damage.

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