Prevalidation of the First German Version of the Vocal Fatigue Index (VFI)

Study Overview
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Brief Summary
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Vocal fatigue has been described as a common complaint in patients with voice disorders, however to date there is no standardized questionnaire in german language to assess specific symptoms. Main aim of this study is to assess the validity of the first german version of the Vocal Fatigue Index (VFI), and english questionnaire developed for voice patients to assess vocal fatigue. In this study patients with voice disorders will receive the patient based questionnaires Vocal Fatigue Index (VFI), Voice Handicap Index 9 international (VHI 9i) and Vocal Tract Discomfort Scale (VTD), the study information and consent letter together with the standard invitation letter to a voice assessment at the Department for Phoniatrics and Speech Pathology University Hospital Zurich. Data of 93 consecutive volunteering patients will be collected. Furthermore a retest using the VFI will be conducted after 1 week with 10 volunteers. Thereafter construct validity of the VFI as compared to the established voice symptom questionnaires VHI 9i and VTD will be investigated. Further test-retest reliability will be determined.

Official Title
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Prevalidation of the First German Version of the Vocal Fatigue Index (VFI)

Conditions
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Vocal Fatigue

Intervention / Treatment
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* Other: Vocal Fatigue Index (VFI)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age > 18 years voice disorder (all etiologies) Exclusion Criteria: age < 18 Jahre current voice therapy psychological disease botox injection in the Larynx inability to independently fill out the questionnaire

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 99 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Intervention Model: Sequential Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Vocal Fatigue Index (VFI)<br>Standardized Questionnaire assessing vocal fatigue | Other: Vocal Fatigue Index (VFI)<br>* collection of 190 consecutive data sets, participants give separate consent for participating a retest or an interview, retest will be realised with the 10 following volunteers<br>* Other names: Vocal Tract Discomfort Scale (VTD);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Validity of the first German version ot the Vocal Fatigue Index (VFI) compared to the VHI9i and VTD | testing validity of the first German version ot the Vocal Fatigue Index (VFI) compared to the VHI9i and VTD | one day | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reliability of the first German version ot the Vocal Fatigue Index (VFI) compared to the VHI9i and VTD | testing reliability of the first German version ot the Vocal Fatigue Index (VFI) compared to the VHI9i and VTD | one day |