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Clinical Strategies for Sampling Word Recognition Performance.

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Summary

Computer simulations reveal that short word recognition lists (25 words) lack precision for clinical decisions. Longer lists (125 words) are more reliable for assessing performance changes, crucial for audiology protocols.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Biostatistics

Background:

  • Accurate assessment of word recognition ability is critical for diagnosing hearing impairments and guiding treatment.
  • The phonetically balanced (PB) maximum score (PB max) is a key metric, but its precision, especially with limited word lists, requires careful evaluation.
  • Clinical protocols rely on precise measurements to detect significant changes in performance.

Purpose of the Study:

  • To estimate the statistical properties of searches for maximum word recognition ability (PB max) using computer simulations.
  • To model limitations in the precision of word recognition scores to inform clinical audiology protocols.
  • To derive 95% confidence intervals for significant score changes using phonemic scoring.

Main Methods:

  • Computer simulations were used to model word recognition scores with flat performance intensity functions.
  • Simulations assessed the precision of single and multiple word lists for estimating PB max.
  • Initial performance was set at 60%, with a second assessment at 40% to simulate a performance decline.

Main Results:

  • A single 25-word list correctly identified only 58.4% of performance declines from 60% to 40%.
  • A single 125-word list correctly identified 99.8% of these declines.
  • Using multiple lists (3 or 5) to find PB max unexpectedly increased the word recognition score.

Conclusions:

  • Twenty-five-word lists provide unacceptably low precision for clinical decision-making in audiology.
  • Both single and multiple 25-word lists are insufficient for reliable PB max assessment.
  • A table is provided for estimating critical ranges for 50-word lists based on phonemic scoring.