Article

OBJECTIVE: To evaluate the internal construct validity and dimensionality of a
new patient-reported outcome measure for people with traumatic brachial plexus
injury (BPI) based on the International Classification of Functioning, Disability
and Health definition of activity. DESIGN: Cross-sectional study. SETTING: Outpatient clinics. PARTICIPANTS: Adults (age range, 18-82y) with a traumatic BPI (N=106). INTERVENTIONS: There were 106 people with BPI who completed a 51-item
5-response questionnaire. Responses were analyzed in 4 phases (missing responses,
item correlations, exploratory factor analysis, and Rasch analysis) to evaluate
the properties of fit to the Rasch model, threshold response, local dependency,
dimensionality, differential item functioning, and targeting. MAIN OUTCOME
MEASURES: Not applicable, as this study addresses the development of an outcome
measure. RESULTS: Six items were deleted for missing responses, and 10 were
deleted for high interitem correlations >.81. The remaining 35 items, while
demonstrating fit to the Rasch model, showed evidence of local dependency and
multidimensionality. Items were divided into 3 subscales: dressing and grooming
(8 items), arm and hand (17 items), and no hand (6 items). All 3 subscales
demonstrated fit to the model with no local dependency, minimal disordered
thresholds, no unidimensionality or differential item functioning for age, time
postinjury, or self-selected dominance. Subscales were combined into 3 subtests
and demonstrated fit to the model, no misfit, and unidimensionality, allowing
calculation of a summary score. CONCLUSIONS: This preliminary analysis supports
the internal construct validity of the Brachial Assessment Tool, a unidimensional
targeted 4-response patient-reported outcome measure designed to solely assess
activity after traumatic BPI regardless of level of injury, age at recruitment,
premorbid limb dominance, and time postinjury. Further examination is required to
determine test-retest reliability and responsiveness.
CI - Copyright A(c) 2016 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS