Psychometric properties of the Fatigue Severity Scale: Rasch analyses of responses in a Norwegian and a Swedish MS cohort
Psychometric properties of the Fatigue Severity Scale: Rasch analyses of responses in a Norwegian and a Swedish MS cohort
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DOI：
10.1177/1352458510370792
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发表时间：
2010-06-01
影响因子：
5.8
通讯作者：
von Koch, L.
中科院分区：
文献类型：
--
作者：
Lerdal, A.;Johansson, S.;von Koch, L.
背景资料：目的：探讨多发性硬化症（MS）患者疲劳严重程度量表（FSS-9）的心理测量学特征：量表内部效度、个人反应效度、单维度性、统一差异项目功能、反应模式的时间稳定性以及区分不同疲劳人群的能力。对挪威和瑞典MS队列的数据进行了为期两年的Rasch分析。FSS-9中的项目估计在性别或教育水平之间没有差异，但在残疾、病程和评估时间方面在队列之间有差异，但是，第1项和第2项在两个队列中均显示出不可接受的高装备均方值。在FSS-7项目版本中，挪威队列中的项目3和4以及瑞典队列中的项目4显示出不可接受的拟合优度，但分离指数较高。在FSS-7中，第一个一维因素解释了87.5%（挪威队列）和86.4%（瑞典队列）的总variation.Conclusions：在MS中，FSS-7表现出更好的心理测量性能比FSS-9;项目1和2既不经验也不概念上适合与其他7个项目。
Background: Rigorous testing of the original Fatigue Severity Scale (FSS-9) with modern psychometric methods is warranted.Objective: To determine the psychometric properties of the FSS-9 in multiple sclerosis (MS): internal scale validity; person response validity; unidimensionality; uniform differential item functioning; temporal stability of response patterns; and ability to separate people into distinct groups of fatigue.Methods: Rasch analyses were conducted on data from a Norwegian and a Swedish MS cohort followed for two years.Results: Item estimations in the FSS-9 did not differ between sex or levels of education but between the cohorts with regard to disability, disease course and time for evaluation, however, items 1 and 2 demonstrated unacceptable high outfit mean-square values in both cohorts. In an FSS-7 item version, items 3 and 4 in the Norwegian and 4 in the Swedish cohort demonstrated unacceptable goodness of fit but high separation indexes. In the FSS-7, the first unidimensional factor explained 87.5% (Norwegian cohort) and 86.4% (Swedish cohort) of the total variation.Conclusions: In MS, the FSS-7 demonstrates better psychometric properties than the FSS-9; items 1 and 2 neither empirically nor conceptually fit with the other seven items.