Articles have appeared in various journals reporting correlations between different tests of hearing acuity.1,5,6 These reports have dealt with the use of one test as a predictor of hearing function as it would be measured by another test. Usually this attempt at prediction has concerned the relationship between a pure-tone average and some type of speech reception threshold (SRT) test. Commonly, the pure-tone average has been based on the "three-frequency average" of hearing acuity at 500, 1,000, and 2,000 cps. The major exception to this pattern is the "two-frequency average" method advocated by Fletcher.3 In computing the two-frequency average, the hearing loss for pure tones at 500, 1,000, and 2,000 cps is observed and the average of the two smallest values of loss is taken as the estimate of SRT. Quiggle et al.5 have presented another variation in the use of pure-tone thresholds as predictors of SRT.
JAMES T. GRAHAM. Evaluation of Methods for Predicting Speech Reception Threshold. Arch Otolaryngol. 1960;72(3):347–350. doi:10.1001/archotol.1960.00740010355010
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