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Original Articles

Measuring outcome from vestibular rehabilitation, part II: Refinement and validation of a new self-report measure

, &
Pages 24-37 | Received 28 Sep 2008, Published online: 07 Jul 2009
 

Abstract

A prototype self-report measure of vestibular rehabilitation outcome is described in a previous paper. The objectives of the present work were to identify the most useful items and assess their psychometric properties. Stage 1: One hundred fifty-five participants completed a prototype 36-item Vestibular Rehabilitation Benefit Questionnaire (VRBQ). Statistical analysis demonstrated its subscale structure and identified redundant items. Stage 2: One hundred twenty-four participants completed a refined 22-item VRBQ and three established questionnaires (Dizziness Handicap Inventory, DHI; Vertigo Symptom Scale short form, VSS-sf; Medical Outcomes Study short form 36, SF-36) in a longitudinal study. Statistical analysis revealed four internally consistent subscales of the VRBQ: Dizziness, Anxiety, Motion-Provoked Dizziness, and Quality of Life. Correlations with the DHI, VSS-sf, and SF-36 support the validity of the VRBQ, and effect size estimates suggest that the VRBQ is more responsive than comparable questionnaires. Twenty participants completed the VRBQ twice in a 24-hour period, indicating excellent test-retest reliability. The VRBQ appears to be a concise and psychometrically robust questionnaire that addresses the main aspects of dizziness impact.

Abbreviations
DBS=

Dizziness Beliefs Scale

DFI=

Dizzy Factor Inventory

DHI=

Dizziness Handicap Inventory

UCLA-DQ=

UCLA Dizziness Questionnaire

VADL=

Vestibular Disorders Activities of Daily Living

VHQ=

Vertigo Handicap Questionnaire

VR=

Vestibular rehabilitation

VRBQ=

Vestibular Rehabilitation Benefit Questionnaire

VSS=

Vertigo Symptom Scale

Abbreviations
DBS=

Dizziness Beliefs Scale

DFI=

Dizzy Factor Inventory

DHI=

Dizziness Handicap Inventory

UCLA-DQ=

UCLA Dizziness Questionnaire

VADL=

Vestibular Disorders Activities of Daily Living

VHQ=

Vertigo Handicap Questionnaire

VR=

Vestibular rehabilitation

VRBQ=

Vestibular Rehabilitation Benefit Questionnaire

VSS=

Vertigo Symptom Scale

Sumario

Se describe un prototipo de una medida de auto-reporte de resultados de rehabilitación vestibular en un trabajo acompañante. Los objetivos del presente trabajo fueron la identificación de los ítems más útiles y la evaluación de sus propiedades psicométricas. Etapa 1: Ciento cincuenta y cinco participantes completaron un Cuestionario de Beneficios de Rehabilitación Vestibular (VRBQ) de 36 reactivos. El análisis estadístico demostró su estructura de sub-escala e identificó ítems redundantes. Etapa 2: Ciento veinticuatro participantes completaron un VRBQ refinado de 22 reactivos y tres cuestionarios establecidos (el Inventario de Discapacidad por Mareo, DHI; la forma corta de la Escala de Síntomas de Vértigo, VSS-sf; la forma corta del Estudio de Resultados Médicos 36, SF-36) en un estudio longitudinal. El análisis estadístico reveló cuatro sub-escalas del VRBQ, internamente consistentes: Mareo, Ansiedad, Mareo inducido por el Movimiento y Calidad de Vida. Las correlaciones con el DHI, VSS-sf, y el SF-36 apoyan la validez del VRBQ, y los estimados del efecto del tamaño sugieren que el VRBQ es más sensible que otros cuestionarios comparables. Veinte participantes completaron el VRBQ dos veces en un período de 24 horas, indicando una excelente confiabilidad test-retest. El VRBQ parece ser un cuestionario conciso y psicométricamente robusto, que maneja los aspectos principales del impacto del mareo.

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