Psychometric Evaluation of the Brachial Assessment Tool Part 1: Reproducibility

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Hill, Bridget
Williams, Gavin
Olver, John
Ferris, Scott
Bialocerkowski, Andrea
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2018
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http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract

Objective: To evaluate reproducibility (reliability and agreement) of the Brachial Assessment Tool (BrAT), a new patient-reported outcome measure for adults with traumatic brachial plexus injury (BPI).

Design: Prospective repeated-measure design.

Setting: Outpatient clinics.

Participants: Adults with confirmed traumatic BPI (N=43; age range, 19–82y).

Interventions: People with BPI completed the 31-item 4-response BrAT twice, 2 weeks apart. Results for the 3 subscales and summed score were compared at time 1 and time 2 to determine reliability, including systematic differences using paired t tests, test retest using intraclass correlation coefficient model 1,1 (ICC1,1), and internal consistency using Cronbach α. Agreement parameters included standard error of measurement, minimal detectable change, and limits of agreement.

Main Outcome Measure: BrAT.

Results: Test-retest reliability was excellent (ICC1,1=.90–.97). Internal consistency was high (Cronbach α=.90–.98). Measurement error was relatively low (standard error of measurement range, 3.1–8.8). A change of >4 for subscale 1, >6 for subscale 2, >4 for subscale 3, and >10 for the summed score is indicative of change over and above measurement error. Limits of agreement ranged from ±4.4 (subscale 3) to 11.61 (summed score).

Conclusions: These findings support the use of the BrAT as a reproducible patient-reported outcome measure for adults with traumatic BPI with evidence of appropriate reliability and agreement for both individual and group comparisons. Further psychometric testing is required to establish the construct validity and responsiveness of the BrAT.

Journal Title
Archives of Physical Medicine and Rehabilitation
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99
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4
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© 2018 The American Congress of Rehabilitation Medicine. Published by Elsevier Ltd. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
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Clinical sciences
Sports science and exercise
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Hill, B; Williams, G; Olver, J; Ferris, S; Bialocerkowski, A, Psychometric Evaluation of the Brachial Assessment Tool Part 1: Reproducibility, Archives of Physical Medicine and Rehabilitation, 2018, 99 (4), pp. 629-634
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