Item response theory has its origins in educational measurement and is now commonly applied in health-related measurement of latent traits, such as function and symptoms. This application is due, in large part, to gains in the precision of measurement attributable to item response theory and corresponding decreases in response burden, study costs, and study duration. The purpose of this paper is twofold: introduce basic concepts of item response theory and demonstrate this analytic approach in a worked example, a Rasch model (1PL) analysis of the Eating Assessment Tool (EAT-10), a commonly used measure for oropharyngeal dysphagia. The results of the analysis were largely concordant with previous studies of the EAT-10 and illustrate for brain impairment clinicians and researchers how IRT analysis can yield greater precision of measurement.

中文翻译：

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项目反应理论和 Rasch 分析简介：使用饮食评估工具 (EAT-10) 的应用

项目反应理论起源于教育测量，现在普遍应用于与健康相关的潜在特征测量，如功能和症状。这种应用在很大程度上是由于项目反应理论带来的测量精度的提高以及反应负担、研究成本和研究持续时间的相应减少。本文的目的有两个：介绍项目反应理论的基本概念，并在一个工作示例中演示这种分析方法，即饮食评估工具 (EAT-10) 的 Rasch 模型 (1PL) 分析，这是口咽性吞咽困难的常用测量方法. 分析结果与之前对 EAT-10 的研究基本一致，并为脑损伤临床医生和研究人员说明 IRT 分析如何产生更高的测量精度。