Rasch validation of the German version of the Prosthesis Embodiment Scale for lower limb amputees and proposal of a revised version.

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    • Subject Terms:
      LEG surgery; ARTIFICIAL limbs; GERMANS; MULTITRAIT multimethod techniques; SCALE analysis (Psychology); DATA analysis; RESEARCH funding; DIFFERENTIAL item functioning (Research bias); RESEARCH methodology evaluation; STATISTICAL sampling; RESEARCH evaluation; AMPUTEES; DESCRIPTIVE statistics; PSYCHOMETRICS; RESEARCH methodology; STATISTICS; COMPARATIVE studies; DATA analysis software; FACTOR analysis; ADULTS
    • Subject Terms:
      GERMANY
    • Abstract:
      To perform a detailed psychometric Rasch analysis of the Prosthesis Embodiment Scale (PEmbS) administered in adults with lower limb amputation (LLA). A convenience sample of German-speaking adults with LLA (n = 150), recruited from German state agencies' databases, was asked to complete the PEmbS, a 10-item patient-reported scale assessing prosthesis embodiment. The local dependency between two items was resolved by keeping for the global score only the lower score of these two items (#9 and #10). Collapsing the seven response categories to four (two expressing disagreement and two agreement) eliminated disordered thresholds. After that, the PEmbS demonstrated unidimensionality, acceptable item fit, and good reliability indices. A keyform plot was created to transform raw scores into linear measures of prosthesis embodiment, making it possible to compare the individual's item responses with those expected by the Rasch model, and to manage missing responses. The PEmbS is useful for assessing prosthesis embodiment in people with LLA, both for research and clinical purposes. We propose a revised version of the PEmbS for lower limb amputees; its appropriateness in other LLA contexts requires further investigation. Prosthesis embodiment has been empirically related to positive clinical outcomes in limb amputees. The Prosthesis Embodiment Scale (PEmbS) is a patient-reported scale that has been recently recommended for use in research on prosthesis embodiment. Rasch analysis showed that the revised version of the German PEmbS is a psychometrically sound instrument for the assessment of prosthesis embodiment in lower limb amputees. The PEmbS thus also allows reliable and valid diagnosis of prosthesis embodiment in clinical and rehabilitation contexts. [ABSTRACT FROM AUTHOR]
    • Abstract:
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