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Differences in nasalance scores obtained with different Nasometer headsets.

Tim Bressmann¹, Blanche Hei Yung Tang^1,2

¹Department of Speech-Language Pathology, University of Toronto, Toronto, Ontario, Canada.

Clinical Linguistics & Phonetics

|February 12, 2024

Summary

Differences in nasalance scores exist between Nasometer headsets. Clinicians should account for a margin of error of ±6 to 8 nasalance points when interpreting scores from different devices.

Keywords:

Nasometer headset measurement variability nasalance

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Area of Science:

Speech-language pathology
Acoustics
Biomedical engineering

Background:

Nasalance measurement is crucial for assessing velopharyngeal function.
Variability in Nasometer headset performance can impact clinical interpretation.
Understanding headset-specific differences is essential for accurate diagnosis.

Purpose of the Study:

To compare nasalance score variations across different Nasometer headset models (6200, 6450, 6500).
To quantify frequency response differences between microphone pairs.
To determine acceptable margins of error for clinical use.

Main Methods:

Comparing long-term average spectra of white noise and babble signals.
Analyzing frequency response characteristics (300-750 Hz) of microphone pairs.
Calculating cumulative absolute differences in nasalance scores within and between headsets.

Main Results:

Cumulative absolute differences ranged from 6.58 to 7.68 dB in the 300-750 Hz range.
Within-headset test-retest differences were up to 6 nasalance points.
Between-headset differences reached up to 8 nasalance points.

Conclusions:

Significant differences in nasalance scores were observed between and within Nasometer headsets.
Clinicians should consider a margin of error of ±6-8 nasalance points.
Headset selection and calibration are important for reliable nasalance assessment.