Reliability and Validity of Speech Evaluation in Adductor Spasmodic Dysphonia: Common Mistake and Statistical Issues

I was interested to read the paper by Yanagida et al published in Journal of Voice on August 2017.1 The purposes of the authors were to evaluate speech in patients with adductor spasmodic dysphonia (ADSD) by perceptual evaluations and acoustic measures, and to examine the reliability and validity of these measures.1 Twenty-four patients with ADSD and 24 healthy volunteers were included in the study. Speech materials consisted of three sentences constructed from serial voiced syllables to elicit abductor voice breaks.

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