Translation and validation of the Dutch language version of the CDC Symptom Inventory for assessment of Chronic Fatigue Syndrome (CFS).
Vermeulen, Ruud C W · Population health metrics · 2006 · DOI
Quick Summary
This study tested whether a Dutch translation of a symptom checklist used to diagnose ME/CFS works as well as the original English version. Researchers asked 139 ME/CFS patients and 43 healthy people to complete the questionnaire and compared the results. The Dutch version performed well and gave similar results to the English version, confirming it's a useful tool for doctors and researchers in Dutch-speaking countries.
Why It Matters
This validation study ensures that Dutch-speaking ME/CFS patients and healthcare providers have a reliable, standardized tool for assessing ME/CFS symptoms. Standardized instruments across languages allow for consistent diagnosis and enable international research collaboration and data comparison.
Observed Findings
The Dutch version showed good internal consistency comparable to the original English version.
Sex-related differences were statistically significant in the Dutch version, requiring further investigation.
Age did not significantly influence CDC Symptom Inventory scores.
139 patients (78 CFS, 61 chronic fatigue) and 43 healthy controls completed the questionnaire.
Results in Dutch-speaking countries matched outcomes from English-speaking countries.
Inferred Conclusions
The Dutch translation of the CDC Symptom Inventory is a reliable tool for assessing secondary criteria for ME/CFS in Dutch-speaking populations.
The psychometric properties of the Dutch version are comparable to the original English version.
Sex-related differences merit further investigation despite overall reliability of the instrument.
The tool enables consistent assessment of ME/CFS symptoms across different language groups and healthcare settings.
Remaining Questions
Why do significant sex-related differences appear in the Dutch version when they were not a major finding in the original English validation?
What This Study Does Not Prove
This study does not establish the CDC Symptom Inventory as a diagnostic gold standard—it only validates its reliability as a secondary assessment tool. The study also does not explain the underlying causes of ME/CFS or clarify the significant sex-related differences observed in the Dutch version. Results are limited to a tertiary care setting and may not represent all ME/CFS patient populations.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →