Screening for psychological distress using internet administration of the Hospital Anxiety and Depression Scale (HADS) in individuals with chronic fatigue syndrome. — CFSMEATLAS
Screening for psychological distress using internet administration of the Hospital Anxiety and Depression Scale (HADS) in individuals with chronic fatigue syndrome.
McCue, Patricia, Buchanan, Tom, Martin, Colin R · The British journal of clinical psychology · 2006 · DOI
Quick Summary
This study tested whether an online questionnaire called the HADS (Hospital Anxiety and Depression Scale) accurately measures anxiety and depression in people with ME/CFS. Researchers found that people with ME/CFS did have higher anxiety and depression scores than healthy controls, but the online format may have artificially inflated these scores. The questionnaire appears useful for screening but measures three different aspects of emotional distress rather than just two as previously thought.
Why It Matters
Anxiety and depression are common in ME/CFS and can complicate diagnosis and treatment. This study provides evidence that the HADS can reliably identify these psychological symptoms in CFS populations, though users must understand how the assessment tool works and account for testing methodology when interpreting results.
Observed Findings
CFS participants had significantly higher HADS anxiety and depression scores than healthy controls.
The HADS structure loaded onto a 3-factor solution rather than the traditional 2-factor model (anxiety and depression).
Internal consistency was acceptable for anxiety and depression subscales in both CFS and control groups.
Internet administration of the HADS appeared to artificially inflate subscale scores as a testing artifact.
The same factor structure held across both CFS and control groups.
Inferred Conclusions
The HADS is psychometrically suitable for screening psychological distress in CFS populations.
The instrument measures three distinct domains of affective disturbance, not two as the standard scoring system suggests.
Researchers must use consistent administration methods (online vs. paper) when comparing psychological distress across clinical groups to avoid confounding methodology with genuine group differences.
Clinicians should interpret HADS results with awareness of the 3-domain structure underlying the measure.
Remaining Questions
What are the clinical implications of the 3-factor structure for interpretation and treatment of anxiety and depression in CFS?
What This Study Does Not Prove
This study does not establish that anxiety and depression cause ME/CFS, nor does it determine whether elevated psychological distress in ME/CFS patients results from the physical illness or represents a primary psychiatric condition. The cross-sectional design cannot establish temporal relationships or causality. The findings about internet administration artifacts require replication and do not definitively apply to all online assessment contexts.
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 →
Does the inflation of scores from internet administration occur equally across anxiety and depression domains, or differentially?
How do HADS scores in CFS relate to other validated measures of anxiety and depression, and do those measures show similar administration artifacts?
Does the elevated psychological distress in CFS reflect reactive adjustment to chronic illness or primary mood disorder, and can HADS distinguish between these?