A number of assessment instruments are available for assessing outcomes of mobility device interventions, but it is unclear to which degree the outcome dimensions are overlapping. In this study the relationship within and between three categories of selfreported power mobility outcome dimensions each encompassing two dimensions, delimited on basis of the CATOR taxonomy, was investigated utilizing data from a Nordic study, which included 137 persons using powered wheelchair or scooter. The study showed that the outcome dimensions only correlated weakly or modestly, and in some cases no correlation at all was found. This indicates that each dimension constitutes a separate construct, and that assessment of one outcome dimension cannot replace another. Overall the outcome dimensions within each category correlated more with each other than with outcome dimensions from other categories, lending support to the CATOR taxonomy.
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