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Cross-Validation and Normative Values for the German Vocal Tract Discomfort Scale.

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The German Vocal Tract Discomfort Scale (VTD Scale) reliably measures voice disorder symptoms. This validated questionnaire aids in diagnosing and assessing the severity of laryngeal discomfort in patients.

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Area of Science:

  • Otolaryngology
  • Speech-Language Pathology
  • Psychometrics

Background:

  • Vocal tract discomfort symptoms are common in individuals with voice disorders.
  • A reliable and valid self-rating scale is needed for assessing these symptoms.
  • The Vocal Tract Discomfort Scale (VTD Scale) is a tool for evaluating laryngeal physical symptoms.

Purpose of the Study:

  • To investigate the reliability, validity, sensitivity, and specificity of the first German version of the VTD Scale.
  • To provide normative data, pathology thresholds, and a scaling scheme for the German VTD Scale.

Main Methods:

  • A retrospective multicenter study involving 571 participants (447 with voice disorder, 124 healthy).
  • Clinical examination included patient history, laryngeal examination, acoustic/aerodynamic assessment, perceptual analysis, and subjective evaluation (VTD Scale, VHI).
  • Statistical analyses included group comparisons, correlation, Cronbach's alpha, and receiver operating characteristic (ROC) analysis.

Main Results:

  • Highly significant differences in VTD Scale scores between healthy and voice-disordered participants.
  • Excellent internal consistency (Cronbach's alpha = .928) and moderate correlation with the Voice Handicap Index (VHI).
  • ROC analysis demonstrated good discriminatory ability (AUC = 0.876), establishing cutoff scores for disorder severity.

Conclusions:

  • The German VTD Scale demonstrates excellent reliability and validity for assessing voice disorders.
  • It provides independent diagnostic information and complements existing voice assessment tools.
  • The established scaling allows for patient screening and referral guidance based on symptom severity.