Observations on Relations Between Thresholds for Pure Tones and for Speech

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Abstract
The prediction of SRT for spondees from pure-tone thresholds is considered in two ways. First, review of statistical studies on the relationship between sensitivity for pure tones and SRT for spondees shows their results to be inconclusive and confusing for the clinician except to demonstrate that frequencies outside the 500–2000 Hz range are of minimal importance in estimating SRT. Second, regression equations derived from two new, audiometrically heterogeneous groups reveal that 500 and 1000 Hz carry primary and nearly equal importance as predictors of SRT when audiometric contour is not taken into account. The clinician must bear in mind that any prediction he makes must incorporate a correction constant, which will vary with the calibration of his audiometers and other variables. A reasonable general formula for predicting clinical SRTs for spondees from pure-tone thresholds when audiometric contour is not taken into account and when the testing equipment is calibrated to the new ANSI threshold reference levels is:

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