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Construct validity and reliability of the Sinhala version of the Chalder fatigue questionnaire in a cohort following dengue infection in Sri Lanka

Authors:

N.D. Perera ,

Ministry of Health, LK
About N.D.
MBBS, MSc in Community Medicine, trainee in MD Community Medicine
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S.P. Prathapan,

University of Sri Jayawardenepura, LK
About S.P.

Professor in Community Medicine

Faculty of Medical Sciences,

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D.A. Wass,

University of Sri Jayawardenepura, LK
About D.A.

Consultant Psychiatrist, Senior lecturer in Psychiatry

Faculty of Medical Sciences

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A. Wijewickrama

National Institute of Infectious Diseases (IDH), LK
About A.
Consultant Physician
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Abstract

The objective of the study was to culturally adapt, translate and assess the validity and reliability of the 11-item Chalder Fatigue Questionnaire (CFQ) among adults (18-60 years), confirmed with dengue infection, admitted to a tertiary hospital in Colombo District, Sri Lanka. Modified Delphi Technique was used in cultural adaptation and assessing, face, content and consensual validity. A descriptive cross-sectional validation study was conducted among 110 patients. CFQ was administered one month after having dengue fever in assessing post-infectious fatigue (PIF). CFQ-Sinhala version (CFQ-S) was assessed for construct validity and reliability. Construct validity of the CFQ-Sinhala version was described with hypothesized scale structure and with confirmatory factor analysis. The culturally adapted (CFQ-S) confirmed the original two-factor structure among adults after one month of having Dengue infection. CFQ-S demonstrated satisfactory internal consistency of ≥ 0.7. Cronbach’s alpha coefficient was 0.85 for the overall scale. The test-retest reliability was assessed by calculating the intra-class correlation coefficient between the two assessments and reported as 0.89 on the overall scale. The study confirmed satisfactory levels of validity and the reliability of the CFQ-S, as a valid tool to screen for PIF. The two-factor model described by the original author was confirmed as the best fitting model by triangulation of results.

How to Cite: Perera, N.D., Prathapan, S.P., Wass, D.A. and Wijewickrama, A., 2021. Construct validity and reliability of the Sinhala version of the Chalder fatigue questionnaire in a cohort following dengue infection in Sri Lanka. Journal of the National Science Foundation of Sri Lanka, 49(3), pp.441–450.
Published on 30 Nov 2021.
Peer Reviewed

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