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Related Experiment Videos

Using audiometric thresholds and word recognition in a treatment study.

Chris Halpin1, Steven D Rauch

  • 1Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts 02114, USA. cfhalpin@meei.harvard.edu

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|December 24, 2005
PubMed
Summary

A progressive floor effect in hearing recovery can limit the detection of significant treatment results. Using single-value criteria for word recognition change may lead to approximately 9% miscategorization errors compared to binomial methods.

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Area of Science:

  • Audiology
  • Biostatistics
  • Clinical Research

Background:

  • Hearing threshold improvement in treatment studies can be limited by a floor effect.
  • This effect, where recovery is constrained by initial severity, may obscure treatment superiority if inclusion criteria are not carefully set.
  • Assessing significant changes in word recognition scores requires appropriate statistical criteria.

Purpose of the Study:

  • To investigate the impact of a progressive floor effect on detecting significant hearing threshold improvements in treatment studies.
  • To compare the accuracy of single-number criteria versus binomial critical difference methods for determining significant changes in word recognition scores.

Main Methods:

  • A treatment study of sudden sensorineural hearing loss (n=318) was analyzed.

Related Experiment Videos

  • Single-number criteria (e.g., 15 percentage points) were compared with 95% (p=0.05) binomial critical difference criteria for monosyllables.
  • The influence of starting score values (0%, 50%, 100%) on critical differences was examined.

    • Main Results:

    • A progressive floor effect was observed, co-varying with hearing threshold recovery, potentially constraining the detection of significant differences.
    • In the dataset, single-value criteria for word recognition change resulted in an approximate 9% miscategorization error rate compared to binomial critical difference criteria.

    Conclusions:

    • The progressive floor effect can limit the ability to detect significant treatment effects in hearing recovery studies.
    • Single-value criteria for word recognition change are less accurate than binomial methods, leading to potential misclassification of results.