[Psychometric Evaluation of the 'German Neurological Fatigue Index for Multiple Sclerosis (NFI-MS-G)' in a Sample of Rehabilitation Patients with Multiple Sclerosis].

IF 1.4 4区 医学 Q3 REHABILITATION
Rehabilitation Pub Date : 2023-02-01 DOI:10.1055/a-1903-4483
Barbara Seebacher, Mike C Horton, Markus Reindl, Christian Brenneis, Rainer Ehling, Florian Deisenhammer, Roger J Mills
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引用次数: 0

Abstract

Purpose: The purpose of this study was to provide a patient-reported outcome measure for people with multiple sclerosis (MS) comprehensively reflecting the construct of fatigue and developed upon the assumptions of the Rasch model. The Neurological Fatigue Index - Multiple Sclerosis (NFI-MS) is based on both a medical and patient-described symptom framework of fatigue and has been validated. Therefore, in this study the German version of the NFI-MS (NFI-MS-G) consisting of a physical and cognitive subscale and a summary scale was validated.

Method: In this bi-centre-study, 309 people with MS undergoing outpatient rehabilitation or being≥2 months before or after their inpatient rehabilitation completed the German NFI-MS-G twice within 14-21 days together with other questionnaires. Correlation with established questionnaires and Rasch analysis were used for its validation. Additionally, psychometric properties of known-groups validity, internal consistency, test-retest reliability, measurement precision and readability were tested. Finally, the English NFI-MS and German NFI-MS-G were compared with each other to equate the language versions.

Results: The NFI-MS-G showed good internal construct validity, convergent and known-groups validity and internal consistency (Cronbach's alpha 0.84-0.93). The physical subscale showed minor local dependencies between items 1 and 7, 2 and 3 and 4 to 6, that could be treated by combining the respective items to testlets. Unidimensionality was found for the physical and cognitive subscales but not for the summary scale. Replacing the summary scale, a 2-domains subtest measuring the higher-order construct of fatigue was created. Good test-retest reliability (Lin's concordance correlation coefficient of 0.86-0.90) and low floor and ceiling effects were demonstrated. The NFI-MS-G was found easily readable and invariant across groups of gender, age, disease duration, timepoint and centre.

Conclusion: The German version of the NFI-MS comprehensively represents the construct of fatigue and has adequate psychometric properties. The German version differs from the English original version with respect to a lack of unidimensionality of the summary scale and minor local dependencies of the physical subscale that could be canceled out using a testlet analysis.

Abstract Image

[多发性硬化症康复患者“多发性硬化症德国神经疲劳指数(NFI-MS-G)”的心理测量学评价]。
目的:本研究的目的是在Rasch模型的假设基础上,为多发性硬化症(MS)患者提供一个全面反映疲劳结构的患者报告的结果测量。神经疲劳指数-多发性硬化症(NFI-MS)是基于医学和患者描述的疲劳症状框架,并已得到验证。因此,本研究对德语版的NFI-MS (NFI-MS- g)进行了验证,该量表由身体和认知分量表以及总结分量表组成。方法:在本双中心研究中,309例接受门诊康复或住院康复前后≥2个月的MS患者在14-21天内完成了两次德国NFI-MS-G,并进行了其他问卷调查。采用相关问卷和Rasch分析进行验证。此外,还测试了已知组效度、内部一致性、重测信度、测量精度和可读性的心理测量特性。最后,将英语NFI-MS和德语NFI-MS- g进行对比,以确定两种语言版本的一致性。结果:NFI-MS-G具有良好的内部构念效度、收敛组效度和已知组效度以及内部一致性(Cronbach's alpha 0.84-0.93)。物理子量表显示,项目1与7、2与3、4与6之间存在较小的局部依赖性,这可以通过将各自的项目合并到测试中来处理。身体和认知分量表存在单维性,而总结分量表没有。创建了一个测量疲劳高阶结构的2域子测试,取代了总结量表。重测信度好(林氏一致性相关系数为0.86 ~ 0.90),地板和天花板效应低。NFI-MS-G易于阅读,并且在性别、年龄、疾病持续时间、时间点和中心组中保持不变。结论:德文版本的NFI-MS较全面地反映了疲劳的结构,具有较好的心理测量特性。德文版本与英文原始版本的不同之处在于,总结比例尺缺乏单维性,物理子比例尺的局部依赖性较小,可以使用测试分析来消除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Rehabilitation
Rehabilitation REHABILITATION-
CiteScore
0.90
自引率
11.10%
发文量
0
审稿时长
6-12 weeks
期刊介绍: Die Zeitschrift Die Rehabilitation richtet sich an Mitarbeiterinnen und Mitarbeiter in Einrichtungen, Forschungsinstitutionen und Trägern der Rehabilitation. Sie berichtet über die medizinischen, gesetzlichen, politischen und gesellschaftlichen Grundlagen und Rahmenbedingungen der Rehabilitation und über internationale Entwicklungen auf diesem Gebiet. Schwerpunkte sind dabei Beiträge zu Rehabilitationspraxis (medizinische, berufliche und soziale Rehabilitation, Qualitätsmanagement, neue Konzepte und Versorgungsmodelle zur Anwendung der ICF, Bewegungstherapie etc.), Rehabilitationsforschung (praxisrelevante Ergebnisse, Methoden und Assessments, Leitlinienentwicklung, sozialmedizinische Fragen), Public Health, Sozialmedizin Gesundheits-System-Forschung sowie die daraus resultierenden Probleme.
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