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Reliability of laryngostroboscopic evaluation on lesion size and glottal configuration: A revisit

Authors

  • Edwin M. L. Yiu PhD,

    Corresponding author
    1. Voice Research Laboratory, Division of Speech & Hearing Sciences, University of Hong Kong, Pokfulam, Hong Kong
    • Send correspondence to Edwin Yiu, PhD, Division of Speech & Hearing Sciences, The University of Hong Kong, Pokfulam, Hong Kong. E-mail: eyiu@hku.hk

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  • Vivian C. Y. Lau BSc,

    1. Voice Research Laboratory, Division of Speech & Hearing Sciences, University of Hong Kong, Pokfulam, Hong Kong
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  • Estella P. M. Ma PhD,

    1. Voice Research Laboratory, Division of Speech & Hearing Sciences, University of Hong Kong, Pokfulam, Hong Kong
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  • Karen M. K. Chan PhD,

    1. Voice Research Laboratory, Division of Speech & Hearing Sciences, University of Hong Kong, Pokfulam, Hong Kong
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  • Elizabeth Barrett PhD

    1. Voice Research Laboratory, Division of Speech & Hearing Sciences, University of Hong Kong, Pokfulam, Hong Kong
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  • This project was funded in part by a grant from the National Center for Complementary and Alternative Medicine, National Institutes of Health (1 R21 AT 003879-01).

  • The authors have no other funding, financial relationships, or conflicts of interest to disclose.

Abstract

Objectives/Hypothesis

This study investigated the inter-rater and intrarater reliability of four basic visual perceptual parameters (lesion size rating and glottal configuration) in laryngostroboscopic evaluation.

Study Design

Cohort Study.

Methods

Two hundred fifty-five laryngostroboscopic video samples were evaluated by three raters on four measurements: 1) mass lesion size rating, 2) amplitude of vocal fold vibration, 3) supraglottic activity, and 4) shape of the glottal closure using the modified Stroboscopy Examination Rating Form.

Results

Good inter- and intrarater reliability were found in rating the lesion size (0.75–0.81, P = .001), anteroposterior supraglottic activity (0.64, P = .001), and glottal closure (0.65, P = .001). Inter-rater reliability in evaluating the mediolateral supraglottic activity and the amplitude of vocal fold vibration were low to moderate (0.50 and 0.46, respectively, P = .001), whereas the intrarater reliability was more variable (0.2–0.70).

Conclusions

The findings indicated that the evaluation of static structures like lesion size rating, the anteroposterior supraglottic compression, and the glottal closure is a relatively reliable method. The evaluation of dynamic structures, such as the vocal fold vibratory amplitude measure was, however, found to be of low reliability.

Level of Evidence

NALaryngoscope, 124:1638–1644, 2014

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