Related Experiment Video
Updated: Aug 7, 2026

A Protocol for Comprehensive Assessment of Bulbar Dysfunction in Amyotrophic Lateral Sclerosis (ALS)
Published on: February 21, 2011
Norms for disproportionate loss in speech intelligibility
M W Yellin1, J Jerger, R C Fifer
1Baylor College of Medicine, Houston, Texas.
Abstract:
The audiometric records of 324 subjects with sensorineural hearing loss, presumed to be cochlear, were analyzed in order to develop norms for "disproportionate loss" in speech intelligibility. From the scatterplot relating PBmax to PTA2 (average of HTLs at 1,000, 2,000, and 4,000 Hz), and the scatterplot relating SSImax to PTA1 (average of HTLs at 500, 1,000, and 2,000 Hz), linear boundaries were constructed encompassing approximately 98% of observed values. A speech intelligibility score (PB or SSI) may be considered "disproportionately poor" if it falls below this empirically derived boundary.
More Related Videos
Related Concept Videos
Expected Frequencies in Goodness-of-Fit Tests
Difference from Background: Limit of Detection
The LOD indicates the presence or absence...

