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Vocal Fatigue Index (VFI): Development and Validation

  • Chayadevie Nanjundeswaran
    Correspondence
    Address correspondence and reprint requests to Chayadevie Nanjundeswaran, Department of Audiology and Speech-Language Pathology, College of Clinical and Rehabilitative Health Sciences, East Tennessee State University, Lamb Hall, Box 70643, Johnson City, TN 37614.
    Affiliations
    Department of Audiology and Speech-Language Pathology, East Tennessee State University, Johnson City, Tennessee
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  • Barbara H. Jacobson
    Affiliations
    Department of Hearing & Speech Sciences, Vanderbilt Bill Wilkerson Center, Vanderbilt University Medical Center, Nashville, Tennessee
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  • Jackie Gartner-Schmidt
    Affiliations
    University of Pittsburgh Voice Center, University of Pittsburgh, Pittsburgh, Pennsylvania
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  • Katherine Verdolini Abbott
    Affiliations
    University of Pittsburgh Voice Center, University of Pittsburgh, Pittsburgh, Pennsylvania

    Department of Communication Science and Disorders, University of Pittsburgh, Pittsburgh, Pennsylvania

    Department of Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania

    McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania

    Center for the Neural Basis of Cognition, Carnegie Mellon University and University of Pittsburgh, Pittsburgh, Pennsylvania
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      Summary

      Objective

      To develop a psychometrically sound self-report questionnaire, the Vocal Fatigue Index (VFI), to help identify individuals with vocal fatigue (VF) and characterize their complaints.

      Study Design

      Descriptive research—scale development.

      Methods

      Four laryngologists and six speech-language pathologists specialized in voice created a beta version of the VFI (version 1), an index of 21 statements they considered to reflect VF. Two hundred patients presenting to two different clinics completed the VFI-1. Two items from VFI-1 were excluded because of poor item-to-total correlations. The final VFI of 19 items (version 2), completed by 105 patients with voice complaints and 70 vocally healthy individuals, was assessed for its psychometric properties.

      Results

      Test-retest reliability for the final VFI was generally strong, as was sensitivity and specificity using the classification table under logistic regression for correctly distinguishing individuals with and without VF. Moreover, factor analysis indicated that VF may be characterized by three factors: (1) factor 1, related to tiredness of voice and voice avoidance, (2) factor 2, related to physical discomfort associated with voicing, and (3) factor 3, related to improvement of symptoms with rest.

      Conclusion

      The VFI is a standardized tool that can identify individuals with probable VF with good reliability, validity, sensitivity, and specificity.

      Key Words

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