OBJECTIVE Evaluate the psychometric properties of the SCI-SET and PRISM using Rasch analysis to optimize their validity and efficiency. DESIGN Rasch analysis of the SCI-SET and PRISM represents a secondary analysis of data collected as part of a collaborative research project of the SCI Model Systems Centers. The overall survey was organized into four sections: 1) participant demographics and injury characteristics, 2) participant experiences of spasticity, 3) SCI-SET, and 4) PRISM. Participants were recruited from the community via multiple avenues. Data were collected and managed via an online survey tool using a secure web-based data management application. SETTING Participating SCI Model Systems Centers. PARTICIPANTS Most participants (N = 1,239) have lived with their injury for more than two years and used a wheelchair as their primary mode of mobility. Majority of the sample (58%) sustained cervical injuries. INTERVENTIONS None. MAIN OUTCOME MEASURES SCI-SET and PRISM. RESULTS The SCI-SET demonstrated strong measurement properties with acceptably high reliability and point-measure correlations, and no evidence of multidimensionality. However, respondents underused some rating scale categories. Analyses of the PRISM demonstrated three distinct subscales relating to the physical, psychological, and social influences of spasticity; respondents underused some rating scale categories. Combining underused rating scale categories for both spasticity instruments resulted in increased reliability and reduced respondent burden compared to the original versions. Both the modified SCI-SET (person separation reliability = 0.93) and PRISM (person separation reliability = 0.85, 0.89, 0.83 for physical, psychological, and social subscores) display strong measurement properties. CONCLUSIONS Measurement properties of the SCI-SET and PRISM improved from use of Rasch model methods. The SCI-SET required minor revisions, whereas the PRISM required definition of subscores. Both modified spasticity measures demonstrated adequate psychometric properties and correlations among the modified measures were high, providing evidence of convergent validity. We recommend use of the modified SCI-SET and PRISM measures in future studies.

中文翻译：

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针对创伤性脊髓损伤患者的改良 PRISM 和 SCI-SET 痉挛测量：Rasch 分析的结果

目标 使用 Rasch 分析评估 SCI-SET 和 PRISM 的心理测量特性，以优化其有效性和效率。SCI-SET 和 PRISM 的设计 Rasch 分析代表对作为 SCI 模型系统中心合作研究项目的一部分收集的数据的二次分析。总体调查分为四个部分：1) 参与者人口统计和损伤特征，2) 参与者痉挛经历，3) SCI-SET，以及 4) PRISM。参与者是通过多种途径从社区招募的。数据是通过在线调查工具使用基于网络的安全数据管理应用程序收集和管理的。设置参与的 SCI 模型系统中心。参与者 大多数参与者 (N = 1, 239) 已经受伤超过两年，并使用轮椅作为他们的主要行动方式。大多数样本 (58%) 遭受了颈椎损伤。干预 无。主要结局指标 SCI-SET 和 PRISM。结果 SCI-SET 显示出强大的测量特性，具有可接受的高可靠性和点测量相关性，并且没有多维性的证据。但是，受访者未充分利用某些评分量表类别。PRISM 的分析显示了三个不同的分量表，这些分量表涉及痉挛对身体、心理和社会的影响；受访者未充分利用某些评分量表类别。与原始版本相比，将两种痉挛工具的未充分利用的评分量表类别相结合，提高了可靠性并减少了受访者的负担。修改后的 SCI-SET（人员分离可靠性 = 0.93）和 PRISM（人员分离可靠性 = 0.85、0.89、0.83 的身体、心理和社会分项）都显示出很强的测量特性。结论 SCI-SET 和 PRISM 的测量特性通过使用 Rasch 模型方法得到改善。SCI-SET 需要小幅修改，而 PRISM 需要对子分数的定义。两种改良的痉挛措施都证明了足够的心理测量特性，并且改良措施之间的相关性很高，提供了收敛效度的证据。我们建议在未来的研究中使用修改后的 SCI-SET 和 PRISM 措施。结论 SCI-SET 和 PRISM 的测量特性通过使用 Rasch 模型方法得到改善。SCI-SET 需要小幅修改，而 PRISM 需要对子分数的定义。两种改良的痉挛措施都证明了足够的心理测量特性，并且改良措施之间的相关性很高，提供了收敛效度的证据。我们建议在未来的研究中使用修改后的 SCI-SET 和 PRISM 措施。结论 SCI-SET 和 PRISM 的测量特性通过使用 Rasch 模型方法得到改善。SCI-SET 需要小幅修改，而 PRISM 需要对子分数的定义。两种改良的痉挛措施都证明了足够的心理测量特性，并且改良措施之间的相关性很高，提供了收敛效度的证据。我们建议在未来的研究中使用修改后的 SCI-SET 和 PRISM 措施。