Abstract
Alghwiri AA, Whitney SL, Baker CE, Sparto PJ, Marchetti GF, Rogers JC, Furman JM.
The development and validation of the Vestibular Activities and Participation measure.
Objectives
To develop and validate a new self-report outcome measure named the Vestibular Activities
and Participation (VAP) for people with vestibular disorders to examine their activities
and participation according to the International Classification of Functioning Disability and Health.
Design
Delphi iterative survey for the development of the VAP and validation study.
Setting
Tertiary balance clinic.
Participants
A panel of worldwide experts (n=17) in vestibular dysfunction participated in the
development of the VAP, and patients (N=58) with vestibular disorders were enrolled
in the validation of the VAP.
Intervention
Not applicable.
Main Outcome Measures
For the development of the VAP, an Internet-based survey of 55 activities and participation
items was presented to the panel of experts and the percentage agreement per item
was calculated. For the validation of the VAP, the VAP was completed twice to examine
the test-retest reliability, the World Health Organization Disability Assessment Schedule
II (WHODAS II) was used to examine the concurrent validity with the VAP, and the Dizziness
Handicap Inventory (DHI) was used to examine the convergent validity of the VAP.
Results
After 2 rounds of the Delphi technique, the VAP was developed. The VAP total score
had excellent test-retest reliability (intraclass correlation coefficient=.95; confidence
interval=.91–.97) and good to excellent agreement per item indicated by the unweighted
kappa (.41–.80) and the weighted kappa (.58–.94). The minimum detectable change at
95% confidence level of the VAP score was .58. The VAP had strong correlation (ρ=.70;
P<.05) with the WHODAS II and moderate to strong correlations (ρ=.54–.74) with the
DHI subscale and total scores. After adjustment for age, we found sex and self-reported
imbalance to be independent explanatory variables of the transformed VAP total score.
Conclusions
The VAP measure was developed to examine the disabling effect of vestibular disorders
on people's activities and participation based on a standardized framework (the International Classification of Functioning Disability and Health). The VAP demonstrated excellent reliability and was validated with external instruments
in people with vestibular disorders.
Key Words
List of Abbreviations:
DHI (Dizziness Handicap Inventory), GLM (generalized linear model), ICC (intraclass correlation coefficient), ICF (International Classification of Functioning Disability and Health), MDC95 (minimum detectable change at 95% confidence level), NA (not applicable), VAP (Vestibular Activities and Participation), WHODAS II (World Health Organization Disability Assessment Schedule II)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: March 29, 2012
Footnotes
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
In-press corrected proof published online on May 11, 2012, at www.archives-pmr.org.
Identification
Copyright
© 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
