Bibliography Fereshtehnejad, S. Find it on PubMed Garber, C. Find it on PubMed Ghajarzadeh. Disability and Rehabilitation, 35 18 : Find it on PubMed Grace, J.

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Search Menu The Fatigue Scale, sometimes referred to as the Chalder Fatigue Scale the CFQ—to differentiate it from chronic fatigue syndrome or CFS , is a self-administered questionnaire for measuring the extent and severity of fatigue within both clinical and non-clinical, epidemiological populations.

Tiredness and fatigue are important in both academic and applied occupational medicine—and the understanding of the link between them and employee health, performance, safety and general workability continues to grow. The need for a reliable self-completion tool that can measure this subjective condition, either in extreme clinical cases or in routine day-to-day functioning, has never been greater [ 3 ].

As a short questionnaire, phrased in simple English with a straightforward answering system, it provides a brief tool to measure both physical and psychological fatigue. For all items, the least symptomatic answers are on the left of the response-set, providing an easy-to-understand checklist for respondents.

Using the Likert scoring method, responses on the extreme left receive a score of 0, increasing to 1, 2 or 3 as they become more symptomatic.

The global score also spans two dimensions—physical fatigue measured by items 1—7 and psychological fatigue measured by items 8— The Likert scoring system allows for means and distributions to be calculated for both the global total as well as the two sub-scales.

The sub-scales of physical and psychological fatigue are not used here, but rather the respondent receives a global binary fatigue score ranging from 0 to Reliability coefficients for the CFQ 11 have been high in studies of CFS patients [ 5 ] as well as occupational and general population research, ranging from 0.

The CFQ 11 has been used widely in studies ascertaining tiredness among working populations as well as patient groups and consistently fares extremely well against other longer and multidimensional tools [ 6 ]. Another advantage is that the CFQ 11 is used widely in occupational research and allows for straightforward comparisons between studies and populations.


Fatigue Severity Scale

Psychometric properties of the scale and discriminative abilities were examined. Principal component analysis PCA was used to explore the structure of the scale. Receiver-operating characteristic curve ROC was used to investigate the discriminative properties. Area under the curve for ROC was. The fatigue scale effectively discriminates, at high scores, between CFS patients and the general population. The CFQ can discriminate reliably between clinical and nonclinical conditions. Copyright c Elsevier Inc.


Fatigue Scales and Chronic Fatigue Syndrome: Issues of Sensitivity and Specificity

Some have argued that these changes should not be seen as merely different scoring schemes, but as different versions of the same scale. The data showed that 22 participants showed improvement at the primary trial endpoint based on one scoring method, while the other scoring method showed a decline. Internal consistency and convergent validity[ edit edit source ] The Chalder fatigue scale has been shown to have good internal consistency, as indicated by a split half reliabilities of 0. Cronbach alpha for the item fatigue scale Chalder et al. Fong et al. Morris et al. These assumptions are untested and their basis is unclear.


Chalder fatigue scale

Abstract Few studies have explored issues of sensitivity and specificity for using the fatigue construct to identify patients meeting chronic fatigue syndrome CFS criteria. In this article, we examine the sensitivity and specificity of several fatigue scales that have attempted to define severe fatigue within CFS. Selecting questions, scales and cut off points to measure fatigue must be done with extreme care in order to successfully identify CFS cases. Keywords: chronic fatigue syndrome, fatigue, fatigue scales, sensitivity and specificity There have been relatively few studies assessing the sensitivity and specificity of fatigue scales which are frequently used to identify individuals with chronic fatigue syndrome CFS and differentiate them from healthy controls.


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