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Psychometric properties of the Dutch Chronic Fatigue Syndrome--Activities and Participation Questionnaire (CFS-APQ).

Abstract：

BACKGROUND AND PURPOSE:The Chronic Fatigue Syndrome-Activities and Participation Questionnaire (CFS-APQ) is a recently developed disease-specific assessment tool for monitoring activity limitations and participation restrictions in patients with chronic fatigue syndrome (CFS). In this study, the convergent validity, content validity, and test-retest reliability of data obtained with the Dutch-language version of the questionnaire were examined. SUBJECTS AND METHODS:One hundred eleven consecutive patients with CFS were enrolled, of whom 47 fulfilled all inclusion criteria. The subjects were first asked to rate their pain, fatigue, and ability to concentrate using 3 visual analog scales, to list at least 5 activities that had become difficult to perform due to their complaints, and to complete the CFS-APQ. Furthermore, subjects were asked to complete a modified version of the CFS-APQ at home and return it to the investigators. The content of the questionnaire was reviewed using the World Health Organization's International Classification of Impairments, Disability and Health (ICIDH) beta II draft. Spearman rank correlation coefficients (R) were used for the convergent validity analysis, and intraclass correlation coefficients were computed for the assessment of the test-retest data. RESULTS:Overall scores on the CFS-APQ correlated with the scores from the visual analog scales for pain (R=.51, P<.001) and fatigue (R=.50, P<.001). The majority of the responses (157 out of 183 answers [85.8%]) to the request to "list difficult activities" matched the content of the CFS-APQ. Using the ICIDH beta II draft, 21 out of 26 questions were found to address activities, and the remaining 5 questions measured the participation level. The Cronbach alpha coefficient was.94, and intraclass correlation coefficients for test-retest reliability of the overall scores were >or= .95 (P<.001). DISCUSSION AND CONCLUSION:The results substantiate the convergent validity, content validity, and reliability of the CFS-APQ scores for patients with CFS.

journal_name

Phys Ther

journal_title

Physical therapy

authors

Nijs J,Vaes P,McGregor N,Van Hoof E,De Meirleir K

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

444-54

issue

eissn

0031-9023

issn

1538-6724

journal_volume

pub_type

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Psychometric properties of the Dutch Chronic Fatigue Syndrome--Activities and Participation Questionnaire (CFS-APQ).