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Nasometric sensitivity and specificity: a cross-dialect and cross-culture study
R M Dalston1, G S Neiman, G Gonzalez-Landa
1Department of Surgery, School of Medicine, University of North Carolina, Chapel Hill 27599-7450.
Summary
This study found a nasalance score of 28 effectively identifies hypernasality in patients. This instrumental measure correlates well with clinical judgment, improving diagnostic efficiency.
Area of Science:
- Speech-Language Pathology
- Medical Diagnostics
Background:
- Hypernasality affects oral-nasal resonance balance.
- Clinical judgments are common but can be subjective.
Purpose of the Study:
- To evaluate the correlation between clinical judgments and nasometric assessment of hypernasality.
- To determine an optimal instrumental threshold for identifying hypernasality.
Main Methods:
- 514 patients from US and Spain clinics evaluated.
- Clinical judgments and nasometric data (oral-nasal resonance balance) collected.
- Pearson correlation and prediction analyses performed.
Main Results:
- A strong correlation (r=0.78) was found between clinical and instrumental measures.
- A threshold nasalance score of 28 optimized identification of hypernasality.
- Sensitivity (0.87), specificity (0.86), and overall efficiency (0.87) were achieved.
Conclusions:
- Nasometric assessment provides an objective measure for hypernasality.
- A nasalance score of 28 is a clinically relevant threshold for diagnosis.
- Instrumental assessment enhances diagnostic accuracy for hypernasality.
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