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Journal of Speech and Hearing Disorders Vol.55 193-197 May 1990.
© American Speech-Language-Hearing Association
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The Reliability of Functional Gain

Larry E. Humes 1 and Elizabeth U. kirn 1

1 Indiana University, Bloomington

This study examined the test-retest reliability of unaided and aided sound-field thresholds and the functional gain values derived from these measurements. Sound-field warble-tone thresholds were obtained at 250, 1000, and 4000 Hz from 24 hearing-impaired listeners with and without their hearing aids. Test-retest standard deviations were significantly larger for functional gain than for unaided thresholds, but only slightly and nonsignificantly larger than for aided thresholds. The variability of functional-gain measures is discussed in relation to measures of insertion gain obtained with probe-tube microphones.

Key Words: hearing aids • real-ear gain • functional gain • threshold

Submitted on November 8, 1988
Accepted on April 27, 1989




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