Sources of Variability Contributing to Test-Retest Differences in Threshold-Based Articulation Indices This study was conducted to obtain information on test-retest differences in Articulation Indices (AI) when a clinical threshold-based method is used to calculate AI. The AI was calculated using a nine-frequency-band method on 2 separate days for 209 ears. Standard deviations of test-retest differences were calculated. The standard deviations were ... Research Article
Research Article  |   May 01, 1990
Sources of Variability Contributing to Test-Retest Differences in Threshold-Based Articulation Indices
 
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Article Information
Research Article   |   May 01, 1990
Sources of Variability Contributing to Test-Retest Differences in Threshold-Based Articulation Indices
Journal of Speech and Hearing Disorders, May 1990, Vol. 55, 275-281. doi:10.1044/jshd.5502.275
History: Received December 27, 1988 , Accepted July 11, 1989
 
Journal of Speech and Hearing Disorders, May 1990, Vol. 55, 275-281. doi:10.1044/jshd.5502.275
History: Received December 27, 1988; Accepted July 11, 1989

This study was conducted to obtain information on test-retest differences in Articulation Indices (AI) when a clinical threshold-based method is used to calculate AI. The AI was calculated using a nine-frequency-band method on 2 separate days for 209 ears. Standard deviations of test-retest differences were calculated. The standard deviations were greatest when the AI was near 50% and least when the AI was near 0% or 100%. The standard deviations for test-retest AI differences were also dependent on the relationship of the hearing thresholds and speech spectrum. Under the assumption that each dB change in threshold would have an affect on the AI, standard deviations of test-retest differences increased significantly. Test-retest standard deviations for nine-band and five-band methods were approximately equal when only five thresholds were actually measured. A small improvement would be expected if the number of threshold measurements increased from five to nine.

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