Department of Psychosomatic Medicine and Psychotherapy, Medical Faculty Mannheim, Central Institute of Mental Health, Heidelberg University, Mannheim, Germany.
Department of Psychiatry, Psychotherapy and Psychosomatics, Faculty of Medicine, RWTH, Aachen, Germany.
Disabil Rehabil. 2024 Apr;46(7):1400-1407. doi: 10.1080/09638288.2023.2199220. Epub 2023 Apr 18.
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 ( = 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.
对下肢截肢患者使用的假体体现量表（PEmbS）进行详细的心理测量 RASCH 分析。
从德国国家机构的数据库中招募了 150 名讲德语的下肢截肢成年人，他们被要求完成 PEmbS，这是一个 10 项的患者报告量表，用于评估假体体现。
通过保留这两个项目（#9 和 #10）中的较低分数，解决了两个项目之间的局部依赖性。将七个反应类别合并为四个（两个表示不同意，两个表示同意）消除了无序阈值。之后，PEmbS 表现出了单维性、可接受的项目拟合度和良好的可靠性指标。创建了关键形式图，将原始分数转换为假体体现的线性度量，从而可以将个体的项目反应与 RASCH 模型预期的反应进行比较，并处理缺失的反应。
PEmbS 可用于评估下肢截肢患者的假体体现，既适用于研究目的，也适用于临床目的。我们为下肢截肢患者提出了 PEmbS 的修订版；其在其他下肢截肢环境中的适用性需要进一步研究。
