Short Increment Sensitivity Index (SISI) scores of patients with and without tone decay were compared to determine the effects of small amounts of tone decay on responses to the SISI test. Similar distributions of SISI scores were obtained for patients with and without tone decay when scores were compared without regard to the hearing level (HL) of the SISI test tone. However, a trend toward lower SISI scores for patients with tone decay was observed when comparisons were restricted to scores obtained at equivalent HL's. For both patients with and without tone decay, a significant positive correlation was obtained between SISI scores and the HL of the SISI test tone. Tone decay may affect the SISI score obtained by patients without retrocochlear pathology.
Bartholomeus B, Swisher L. Tone Decay and SISI Scores: A Clinical Study. Arch Otolaryngol. 1971;93(5):451–455. doi:10.1001/archotol.1971.00770060697002
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