Psychometric evaluation of the Brachial Assessment Tool Part 1: Reproducibility

Publication date: Available online 6 November 2017
Source:Archives of Physical Medicine and Rehabilitation
Author(s): Bridget Hill Grad, Gavin Williams, John Olver, Scott Ferris, Andrea Bialocerkowski
ObjectiveTo 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)DesignProspective repeated measure designSettingOutpatient clinicsParticipantsAdults with confirmed traumatic BPIIntervention43 people (age range 19-82) 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 (ICC 1,1) and internal consistency using Cronbach alpha. Agreement parameters included standard error of measurement, minimal detectable change and limits of agreement.Main outcome measureThe BrATResultsTest retest reliability was excellent (ICC [1,1] = 0.90 – 0.97). Internal consistency was high (Cronbach alpha 0.90 - 0.98). Measurement error was relatively low (SEM 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).ConclusionThese 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.



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