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The ABLE Scale : The Development and Psychometric Properties of an Outcome Measure for the Spinal Cord Injury Population

ARDOLINO EM; HUTCHINSON KJ; PINTO ZIPP G; CLARK M; HARKEMA SJ
PHYS THER , 2012, vol. 92, n° 8, p. 1046-1054
Doc n°: 158663
Localisation : Documentation IRR

D.O.I. : http://dx.doi.org/DOI:10.2522/ptj.20110257
Descripteurs : AE21 - ORIGINE TRAUMATIQUE

A paucity of information exists on the psychometric properties of
several balance outcome measures. With the exception of the Modified Functional
Reach Test, none of these balance outcome measures were developed specifically
for the population with spinal cord injury (SCI). A new balance assessment tool
for people with SCI, the Activity-based Balance Level Evaluation (ABLE scale),
was developed and tested. Objective The purposes of this study were: (1) to
develop a scale capturing the wide spectrum of functional ability following SCI
and (2) to assess the initial psychometric properties of the scale using a Rasch
analysis. Design A methodological research design was used to test the initial
psychometric properties of the ABLE scale. METHODS: /b> The Delphi technique was
used to establish the original 28-item ABLE scale. People with SCI at each of 4
centers (n=104) were evaluated using the ABLE scale. A Rasch analysis was
conducted to test for targeting, item difficulty, item bias, and
unidimensionality. An analysis of variance was completed to test for discriminant
validity. RESULTS: /b> The Rasch analysis revealed a scale with minimal floor and
ceiling effects and a wide range of item difficulty capturing the large scope of
functional capacity after SCI. Multiple redundancies of item difficulty were
observed. Limitations All raters were experienced physical therapists, which may
have skewed the results. The sample size of 104 participants precluded a
principal component analysis. CONCLUSION: /b> Development of an all-inclusive
clinical instrument assessing balance in the SCI population was accomplished
using the Delphi technique. Modifications of the ABLE scale based on the Rasch
analysis yielded a 28-item scale with minimal floor or ceiling effects. Larger
studies using the revised scale and factor analyses are necessary to establish
unidimensionality and reduction of the total item number.

Langue : ANGLAIS

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