Ericsson Anna, Mannerkorpi Kaisa
Department of Rheumatology and Inflammation Research, Sahlgrenska Academy, Göteborg University, Göteborg, Sweden.
Disabil Rehabil. 2007 Nov 30;29(22):1665-70. doi: 10.1080/09638280601055782.
Fibromyalgia (FM) and Chronic Widespread Pain (CWP) are common diseases in primary care and, in addition to the pain they cause, fatigue is a major problem. Fatigue is regarded as a multidimensional concept and instruments assessing fatigue should therefore cover several different dimensions. The Multidimensional Fatigue Inventory (MFI-20) measures five different dimensions of fatigue. The aim of the study was to investigate the test-retest reliability and convergent construct validity of the Swedish version of the MFI-20 in female patients with FM or CWP.
To investigate the convergent construct validity, 166 female patients with FM or CWP completed the Swedish version of the MFI-20 and a Visual Analogue Scale (VAS) measuring global fatigue. Thirty-six of the 166 patients completed the Swedish version of the MFI-20 on two occasions, one day apart to evaluate the test-retest reliability.
Spearman's correlation coefficient revealed a significant association between each of the five subscales of the MFI-20 and the VAS for global fatigue. General Fatigue had the highest correlation with the VAS (rs = 0.62, p < 0.001), while Reduced Motivation had the lowest (rs = 0.32, p <0.001). The intra-class correlation coefficients (ICC) were satisfactory for all the five subscales of the MFI-20.
The results of this study indicate that the Swedish version of the MFI-20 is a reliable tool for assessing the degree of fatigue in patients with FM or CWP. This study also supports the theory that fatigue is a multidimensional concept and different aspects of fatigue should be measured separately.
纤维肌痛（FM）和慢性广泛性疼痛（CWP）是初级保健中的常见疾病，除了它们所引起的疼痛外，疲劳也是一个主要问题。疲劳被视为一个多维度概念，因此评估疲劳的工具应涵盖几个不同维度。多维疲劳量表（MFI - 20）测量疲劳的五个不同维度。本研究的目的是调查瑞典语版MFI - 20在FM或CWP女性患者中的重测信度和收敛效度。
为了调查收敛效度，166名FM或CWP女性患者完成了瑞典语版MFI - 20和一个测量整体疲劳的视觉模拟量表（VAS）。166名患者中的36名在两次不同时间完成了瑞典语版MFI - 20，两次间隔一天，以评估重测信度。
斯皮尔曼相关系数显示，MFI - 20的五个子量表中的每一个与整体疲劳的VAS之间都存在显著关联。一般疲劳与VAS的相关性最高（rs = 0.62，p < 0.001），而动机降低的相关性最低（rs = 0.32，p < 0.001）。MFI - 20的所有五个子量表的组内相关系数（ICC）都令人满意。
本研究结果表明，瑞典语版MFI - 20是评估FM或CWP患者疲劳程度的可靠工具。本研究还支持疲劳是一个多维度概念且应分别测量疲劳不同方面的理论。
