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Custom-molded earplug performance: a retrospective study

C R Smith, J N Wilmoth, T E Borton

    Scandinavian Audiology
    |January 1, 1980
    PubMed
    Summary
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    Custom-molded earplugs effectively prevented significant hearing threshold shifts in textile workers over time. Even with high workplace noise, baseline hearing was a stronger predictor, indicating the protection

    Area of Science:

    • Occupational Health
    • Audiology
    • Industrial Hygiene

    Background:

    • Hearing threshold shifts are a significant concern in occupational settings.
    • Workplace noise exposure is a primary risk factor for hearing loss.
    • The effectiveness of hearing protection devices (HPDs) in long-term prevention requires robust evaluation.

    Purpose of the Study:

    • To evaluate the long-term effectiveness of custom-molded earplugs in preventing hearing threshold shifts.
    • To identify key variables influencing hearing threshold shifts in an occupational cohort.

    Main Methods:

    • A longitudinal study design was used with textile workers (N = 1517).
    • Stepwise regression analysis was employed to assess the influence of workplace noise, age, and ear history on hearing threshold shifts.

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  • Hearing threshold levels were monitored over an extended period.

    • Main Results:

    • Workplace noise level explained a smaller-than-expected proportion of variation in hearing threshold shifts.
    • Baseline hearing values were found to be a significant predictor of hearing threshold shifts, even when analyzed last.
    • Custom-molded earplugs demonstrated efficacy in mitigating substantial hearing threshold changes.

    Conclusions:

    • Custom-molded hearing protection is effective in preventing significant hearing threshold shifts over extended periods.
    • Baseline hearing status is a critical factor in predicting long-term hearing changes, alongside noise exposure.
    • Findings support the use of custom-fitted hearing protection in high-noise occupational environments.