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Journal of Speech, Language, and Hearing Research Vol.50 1203-1209 October 2007. doi:10.1044/1092-4388(2007/084)
© American Speech-Language-Hearing Association
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Critical Difference Table for Word Recognition Testing Derived Using Computer Simulation

Edward Carney
Robert S. Schlauch
University of Minnesota, Minneapolis

Contact author: Edward Carney, 115 Shevlin Hall, 164 Pillsbury Drive, SE, Minneapolis, MN 55455. E-mail: carne006{at}umn.edu.

Purpose: To construct a table for upper and lower limits of the 95% critical range for changes in word recognition scores obtained with monosyllabic word lists (of lengths 10, 25, 50, and 100 words) using newly available methods. Although such a table has been available for nearly 30 years (A. R. Thornton & M. J. M. Raffin, 1978), the earlier table was constructed by calculation and used an approximation to the variance of the difference score between 2 administrations of word lists of identical size. It has been used clinically, reproduced, and recommended for use by clinicians in handbooks and textbooks.

Method: The new table was created using computer simulation of the relevant distributions and a direct estimate of the variance of the difference score between 2 tests, calculated using the simulated results.

Results: The new table differed from the previous table in 23% of entries. Critical ranges were both narrowed (82%) and expanded (18%). No range changed by more than 1 word correct in any direction. The original table was most accurate for list sizes of 25 words each.

Conclusion: Using the new table will provide more accurate estimates of the 95% critical range for successive administrations of word recognition tests.

KEY WORDS: audiology, tables, clinical tests, speech discrimination testing, computer programming


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