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Clinical Rehabilitation
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Improving the Action Research Arm test: a unidimensional hierarchical scale

Johanna H van der Lee

Department of Rehabilitation Medicine and Institute for Research in Extramural Medicine, Amsterdam, The Netherlands; jh.vanderlee{at}vumc.nl

Leo D Roorda

Heleen Beckerman

Gustaaf J Lankhorst

Department of Rehabilitation Medicine and Institute for Research in Extramural Medicine, Amsterdam, The Netherlands

Lex M Bouter

Institute for Research in Extramural Medicine, Vu University Medical Center, Amsterdam, The Netherlands

Background: The Action Research Arm (ARA) test is a performance test of upper extremity motor function which consists of 19 items divided into four hierarchical subtests. This multidimensionality has not yet been tested empirically.

Objective: To investigate the dimensionality of the ARA test.

Design: Cross-sectional study involving a sample of 63 chronic stroke patients.

Methods: A Mokken scale analysis was performed.

Results: The Mokken scale analysis revealed one strong unidimensional scale containing all 19 items, of which the scalability coefficient H was 0.79, while H per item ranged from 0.69 to 0.86. The reliability coefficient rho equalled 0.98, indicating a very high internal consistency. A subset of 15 out of 19 items showed an invariant hierarchical item-ordering.

Conclusion: The ARA test is a unidimensional scale. The use of subtests, as proposed in the original description of the instrument, is not supported by the present findings. The 15-item scale presented here can be used for adaptive testing, i.e. using only a selected subset of items based on prior knowledge about the patient's abilities, thus minimizing testing time.

Clinical Rehabilitation, Vol. 16, No. 6, 646-653 (2002)
DOI: 10.1191/0269215502cr534oa
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