Rasch analysis of the Fatigue Severity Scale in multiple sclerosis
Rasch analysis of the Fatigue Severity Scale in multiple sclerosis
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DOI：
10.1177/1352458508096215
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发表时间：
2009-01-01
影响因子：
5.8
通讯作者：
Tennant, A.
中科院分区：
文献类型：
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作者：
Mills, R. J.;Young, C. A.;Tennant, A.
背景疲劳严重程度量表（FSS-9）已被广泛用作多发性硬化（MS）的结局指标。现代心理测量学理论，在Rasch测量模型的形式，已经建立了新的质量标准的结果measurements通过评估广泛的测量属性，除了经典的测试theorety. ObjectiveTo评估FSS-9的应用Rasch model.Method的FSS-9被张贴到患者的临床确诊MS在英国的两个中心。分析是基于416条记录（55%的回应）。结果9个项目的规模未能达到Rasch模型的预期。两个项目在整个量表上的区分度很差，另外两个项目显示出年龄等因素的偏见。去除这四个项目提供了一个有效的5项Rasch量表，满足严格的测试unidimensionality.Conclusion总结的9个项目的FSS-9是无效的。五个项目（FSS-5），这似乎是衡量疲劳的社会影响，提供了一个严格的一维Rasch量表。使用FSS-9的研究可能需要使用FSS-5重新评价，最好使用Rasch转换评分。多发性硬化2009; 15：81-87. http://msj.sagepub.com
Background The 9-item, Fatigue Severity Scale (FSS-9) has been widely used as an outcome measure in multiple sclerosis (MS). Modern psychometric theory, in the form of the Rasch measurement model, has set new quality standards for outcome measures by appraising a broad range of measurement properties in addition to the reliability and validity emphasized by classical test theory.Objective To appraise the FSS-9 by application of the Rasch model.Method The FSS-9 was posted to patients with clinically definite MS in two centers in the United Kingdom. Analysis was based on 416 records (55% response).Results The 9-item scale failed to meet Rasch model expectations. Two items had poor discrimination across the scale, and two further items showed bias for factors such as age. Removal of these four items provided a valid 5-item Rasch scale that satisfied strict tests of unidimensionality.Conclusion Summating the nine items of the FSS-9 is invalid. Five items (FSS-5), which seem to be measuring the social impact of fatigue, provide a strictly unidimensional Rasch scale. Studies using the FSS-9 may need to be re-evaluated using the FSS-5, preferably using the Rasch transformed scores. Multiple Sclerosis 2009; 15: 81-87. http://msj.sagepub.com