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Title: The high-level mobility assessment tool (HiMAT) for traumatic brain injury. Part 2: content validity and discriminability.
Authors: Williams, Gavin
Other Authors: Robertson, Val
Greenwood, Ken
Goldie, Patricia
Morris, Meg
Keywords: Brain Injuries
Movement Disorders
Outcome Assessment
Reproducibility of Results
Sensitivity and Specificity
High-Level Mobility Assessment Tool
Content Validity
Traumatic Brain Injury
Internal Consistency
Factor Analysis
Rasch Analysis
Therapy Outcomes
Rehabilitation, Mental Health and Chronic Pain Clinical Institute, Epworth HealthCare, Victoria, Australia
Department of Physiotherapy , Epworth Healthcare , Victoria , Australia
Issue Date: Sep-2005
Publisher: Taylor & Francis
Citation: Brain Inj. 2005 Sep;19(10):833-43
Abstract: PRIMARY OBJECTIVES: (i) To assess the measurement properties of the high-level mobility assessment tool (HiMAT) for people with traumatic brain injury (TBI), (ii) to measure the extent to which the HiMAT is a uni-dimensional, discriminative hierarchical outcome scale. RESEARCH DESIGN: The content validity was assessed using a three-stage process of investigating internal consistency, factor analysis and Rasch analysis. The uni-dimensionality of the HiMAT items was also tested. Discriminability was investigated by correlating raw and logit scores obtained from Rasch analysis. The study was conducted at a major rehabilitation facility using a convenience sample of 103 adults with TBI. MAIN OUTCOMES AND RESULTS: The internal consistency for the high-level items was very high (Cronbach's alpha = 0.99). Principal axis factoring identified several balance items as belonging to a second factor not related to high-level mobility, hence these items were excluded. Rasch analysis identified several misfitting items, such as walking around a figure of eight and stopping from a run, which were also excluded. Logit scores were used to exclude clustered and, therefore, redundant items. Raw scores correlated very highly (r = 0.98) with logit scores, indicating that raw scores provided good discriminability and were suitable for use by clinicians. CONCLUSION: The HiMAT, which assesses higher-level mobility requirements of people with TBI for return to pre-accident social, leisure and sporting activities, is a uni-dimensional and discriminative scale for quantifying therapy outcomes.
PubMed URL:
ISSN: 0269-9052
Journal Title: Brain Injury
Type: Journal Article
Affiliated Organisations: The University of Newcastle, Callaghan, NSW, Australia
La Trobe University, Bundoora, VIC, Australia
Type of Clinical Study or Trial: Validation Study
Appears in Collections:Neurosciences

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