Optimising outcome assessment of voice interventions, I: reliability and validity of three self-reported scales

A. L. Webb, P. N. Carding, I. J. Deary, K. MacKenzie, I. N. Steen, J. A. Wilson

Research output: Contribution to journalArticlepeer-review

Abstract

Background: There is an increasing choice of voice outcome research tools, but good comparative data are lacking.

Objective: To evaluate the reliability and validity of three voice-specific, self-reported scales. Design: Longitudinal, cohort comparison study. Setting: Two UK voice clinics: the Freeman Hospital, Newcastle upon Tyne, and the Glasgow Royal Infirmary.

Participants: One hundred and eighty-one patients presenting with dysphonia.

Main outcome measures: All patients completed the vocal performance questionnaire, the voice handicap index and the voice symptom scale. For comparison, each patient's voice was recorded and assessed perceptually using the grade-roughness-breathiness-aesthenia-strain scale. The reliability and validity of the three self-reported vocal performance measures were assessed in all subjects, while 50 completed the questionnaires again to assess repeatability.

Results: The results of the 170 participants with completed data sets showed that all three questionnaires had high levels of internal consistency (Cronbach's alpha 0.81-0.95) and repeatability (voice handicap index = 0.83; vocal performance questionnaire = 0.75; voice symptom scale = 0.63). Concurrent and criterion validity were also good, although, of the grade-roughness-breathiness-aesthenia-strain subscales, roughness was the least well correlated with the self-reported measures.

Conclusion: The vocal performance questionnaire, the Voice handicap index and the voice symptom scale are all reliable and valid instruments for measuring the patient-perceived impact of a voice disorder.

Original languageEnglish
Pages (from-to)763-767
Number of pages5
JournalJournal of Laryngology and Otology
Volume121
Issue number8
DOIs
Publication statusPublished - Aug 2007

Keywords

  • voice
  • voice quality
  • quality of life
  • outcome assessment (healthcare)
  • outcome measures
  • QUALITY-OF-LIFE
  • PERCEPTUAL EVALUATION
  • NONORGANIC DYSPHONIA
  • BOTULINUM TOXIN
  • GRBAS SCALE
  • DISORDERS
  • VALIDATION
  • LARYNGEAL
  • THERAPY

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