期刊
OTOLOGY & NEUROTOLOGY
卷 27, 期 1, 页码 110-116出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00129492-200601000-00020
关键词
audiometry; pure-tone average; hearing thresholds; word recognition
Objectives: First, to examine a possible limit on significant results imposed by a progressive floor effect for hearing threshold improvement in a treatment study. This floor effect for hearing recovery suggests that if inclusion criteria are not set sufficiently high, the superiority of a treatment group may not be detectable. Second, to examine the outcomes when using two different types of criteria for significant change in a subject's word recognition score. Methods: Several single-number criteria (e.g., 15 percentage points) are compared with the 95% (p = 0.05) criteria from the binomial critical difference table for monosyllables. Critical differences for binomial variables change depending on whether the starting value lies in the middle (near 50% correct) or at either extreme of the range of scores (0 or 100%). Different judgments of significant word recognition improve- ment (or decrease) using binomial versus single-value criteria are presented. Data Source: A recent treatment study of sudden sensorineural hearing loss (n = 318) is used to illustrate these effects. Conclusion: First, there is a progressive floor effect of presenting severity that covaries with the outcome measure hearing threshold recovery. In some designs, this may act to constrain the ability to detect a significant difference. Second, in the example data set, the use of single-value criteria for significant within subject change in word recognition (e.g., 15 percentage points) introduced a miscategorization error rate of approximately 9% when compared with the result of the binomial 95% critical difference table.
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