Department of Geriatric Medicine, Oslo University Hospital, P.O Box 4956, Ullevaal, Nydalen, 0424, Oslo, Norway.
Department of Nursing Science and Research Center for Habilitation and Rehabilitation Services and Models (CHARM), University of Oslo, Faculty of Medicine, Institute of Health and Society, P.O. Box 1130, Blindern, N-0318, Oslo, Norway.
Health Qual Life Outcomes. 2020 Jun 5;18(1):168. doi: 10.1186/s12955-020-01419-8.
Fatigue is a common symptom associated with a wide range of diseases and needs to be more thoroughly studied. To minimise patient burden and to enhance response rates in research studies, patient-reported outcome measures (PROM) need to be as short as possible, without sacrificing reliability and validity. It is also important to have a generic measure that can be used for comparisons across different patient populations. Thus, the aim of this secondary analysis was to evaluate the psychometric properties of the Norwegian 5-item version of the Lee Fatigue Scale (LFS) in two distinct patient populations.
The sample was obtained from two different Norwegian studies and included patients 4-6 weeks after stroke (n = 322) and patients with osteoarthritis on a waiting list for total knee arthroplasty (n = 203). Fatigue severity was rated by five items from the Norwegian version of the LFS, rating each item on a numeric rating scale from 1 to 10. Rasch analysis was used to evaluate the psychometric properties of the 5-item scale across the two patient samples.
Three of the five LFS items ("tired", "fatigued" and "worn out") showed acceptable internal scale validity as they met the set criterion for goodness-of-fit after removal of two items with unacceptable goodness-of-fit to the Rasch model. The 3-item LFS explained 81.6% of the variance, demonstrated acceptable unidimensionality, could separate the fatigue responses into three distinct severity groups and had no differential functioning with regard to disease group. The 3-item version of the LFS had a higher separation index and better internal consistency reliability than the 5-item version.
A 3-item version of the LFS demonstrated acceptable psychometric properties in two distinct samples of patients, suggesting it may be useful as a brief generic measure of fatigue severity.
Clinicaltrials.gov: NCT02338869; registered 10/04/2014 (stroke study).
疲劳是一种与多种疾病相关的常见症状，需要更深入地研究。为了最大限度地减少患者负担并提高研究中的应答率，患者报告的结局测量（PROM）需要尽可能简短，同时不牺牲可靠性和有效性。拥有一种可用于比较不同患者群体的通用测量方法也很重要。因此，本二次分析的目的是评估挪威五分量表 Lee 疲劳量表（LFS）在两个不同患者群体中的心理测量特性。
样本来自两项不同的挪威研究，包括中风后 4-6 周的患者（n=322）和等待全膝关节置换术的骨关节炎患者（n=203）。疲劳严重程度由挪威版 LFS 的五个项目评定，每个项目在 1 到 10 的数字评分量表上评分。Rasch 分析用于评估两个患者样本中五分量表的心理测量特性。
五个 LFS 项目中的三个项目（“疲倦”、“疲劳”和“疲惫不堪”）表现出可接受的内部量表有效性，因为在去除两个不符合 Rasch 模型拟合优度的项目后，它们满足了良好拟合的设定标准。3 项 LFS 解释了 81.6%的方差，表现出可接受的单维性，可以将疲劳反应分为三个不同的严重程度组，并且在疾病组方面没有差异功能。3 项 LFS 版本的分离指数更高，内部一致性可靠性更好。
LFS 的 3 项版本在两个不同的患者样本中表现出可接受的心理测量特性，表明它可能是一种有用的疲劳严重程度的简短通用测量方法。
Clinicaltrials.gov：NCT02338869；注册于 2014 年 10 月 4 日（中风研究）。
