The high-level mobility assessment tool (HiMAT) for traumatic brain injury. Part 2: Content validity and discriminability

Williams, G, Robertson, V, Greenwood, K, Goldie, P and Morris, M 2005, 'The high-level mobility assessment tool (HiMAT) for traumatic brain injury. Part 2: Content validity and discriminability', Brain Injury, vol. 19, no. 10, pp. 833-843.


Document type: Journal Article
Collection: Journal Articles

Title The high-level mobility assessment tool (HiMAT) for traumatic brain injury. Part 2: Content validity and discriminability
Author(s) Williams, G
Robertson, V
Greenwood, K
Goldie, P
Morris, M
Year 2005
Journal name Brain Injury
Volume number 19
Issue number 10
Start page 833
End page 843
Total pages 11
Publisher Taylor and Francis
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 a = 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.
Subject Clinical Sciences not elsewhere classified
DOI - identifier 10.1080/02699050500058711
ISSN 0269-9052
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