Limited evidence was found for the psychometric properties and clinical usability of these instruments .
However , the CFS-activities and participation question naire ( APQ ) is a disease-specific instrument with moderate content and construct validity .
PURPOSE To summarize measurement instruments used to evaluate activity limitations and participation restrictions in patients with chronic fatigue syndrome ( CFS ) and review the psychometric properties of these instruments .
Chronic fatigue syndrome causes activity limitations and participation restrictions in one or more areas of life .
The relation of sleep difficulties to fatigue, mood and disability in chronic fatigue syndrome.
The relationship of sleep complaints to mood , fatigue , disability , and lifestyle was examined in 69 chronic fatigue syndrome ( CFS ) patients without psychiatric disorder , 58 CFS patients with psychiatric disorder , 38 psychiatric out- patients with chronic depressive disorders , and 45 healthy controls . The groups were matched for age and gender . There were few differences between the prevalence or nature of sleep complaints of CFS patients with or without current DSM-IIIR depression , anxiety or somatization disorder . CFS patients reported significantly more naps and waking by pain , a similar prevalence of difficulties in maintaining sleep , and significantly less difficulty getting off to sleep compared to depressed patients . Sleep continuity complaints preceded fatigue in only 20 % of CFS patients , but there was a strong association between relapse and sleep disturbance . Certain types of sleep disorder were associated with increased disability or fatigue in CFS patients . Disrupted sleep appears to complicate the course of CFS . For the most part , sleep complaints are either attributable to the lifestyle of CFS patients or seem inherent to the underlying condition of CFS . They are generally unrelated to depression or anxiety in CFS
Limited evidence was found for the psychometric properties and clinical usability of these instruments .
However , the CFS-activities and participation question naire ( APQ ) is a disease-specific instrument with moderate content and construct validity .
PURPOSE To summarize measurement instruments used to evaluate activity limitations and participation restrictions in patients with chronic fatigue syndrome ( CFS ) and review the psychometric properties of these instruments .
Chronic fatigue syndrome causes activity limitations and participation restrictions in one or more areas of life .