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Practice effects in industrial hearing screening.

W G Thomas, L H Royster, C E Scott

    Journal of the American Audiology Society
    |November 11, 1975
    PubMed
    Summary
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    Repeated hearing tests in employees did not show significant improvements in auditory thresholds. However, a notable difference was found between the first and second ear tested, impacting audiometric results.

    Area of Science:

    • Audiology
    • Occupational Health
    • Hearing Science

    Background:

    • Employee hearing health is crucial in occupational settings.
    • Understanding test-retest variability in audiometry is essential for accurate hearing assessments.
    • Previous studies suggest minor improvements in hearing thresholds over time with repeated testing.

    Purpose of the Study:

    • To investigate if repeated audiometric testing leads to significant improvements in mean hearing threshold values among employees.
    • To determine if there is a significant difference in hearing thresholds between the first and second ear tested during an audiometric examination.
    • To explore the effect of ear order on audiometric results.

    Main Methods:

    • Random sampling of approximately 12,000 employees from a large company.

    Related Experiment Videos

  • Analysis of baseline audiograms and two annual retests for 118 employees.
  • Audiometric earphone reversal in a separate sample of 400 employees to compare first vs. second ear testing.
  • Utilized an automatic audiometer for standardized testing.

    • Main Results:

    • No statistically significant improvements in mean hearing threshold values were observed with subsequent annual retests.
    • A consistent and significant difference was found between the first and second ear tested, with the first ear consistently showing poorer thresholds.
    • When earphone order was reversed, the previously poorer ear (left) showed better thresholds in low- and mid-frequencies, while the right ear maintained better thresholds in high frequencies.

    Conclusions:

    • Repeated audiometric testing in this employee population did not yield significant improvements in mean hearing thresholds.
    • The order in which ears are tested significantly influences audiometric outcomes, suggesting a potential learning or fatigue effect.
    • Findings highlight the importance of considering ear-testing order and potential biases in interpreting audiometric data, especially in large-scale occupational hearing conservation programs.