Predictors of response to treatment for chronic fatigue syndrome.
Bentall, Richard P, Powell, Pauline, Nye, Fred J et al. · The British journal of psychiatry : the journal of mental science · 2002 · DOI
Quick Summary
This study looked at which ME/CFS patients improved most with psychological treatment that included graded exercise. Researchers found that patients were less likely to improve if they were members of self-help groups, receiving sickness benefits, or experiencing depression or anxiety. Importantly, how long someone had been sick or how severe their symptoms were did not predict whether treatment would help.
Why It Matters
Understanding which patients respond well to psychological treatments helps clinicians tailor interventions and manage expectations appropriately. This study challenges the assumption that sicker or longer-suffering patients necessarily have worse outcomes, suggesting instead that psychosocial and motivational factors play a crucial role in treatment response for ME/CFS.
Observed Findings
Self-help group membership predicted poor treatment response
Receipt of sickness benefits at baseline predicted poor treatment response
Elevated dysphoria (anxiety and depression) predicted poor treatment response
Symptom severity at baseline did not predict treatment response
Duration of illness prior to treatment did not predict treatment response
Inferred Conclusions
Psychosocial factors and motivation to treatment adherence are more important predictors of outcome than disease characteristics alone
Variables indicating resistance to the therapeutic rationale (group membership, benefits dependency) are associated with worse outcomes
Secondary gains from illness may influence treatment engagement and response
Patient expectations and beliefs about illness may be modified to improve treatment outcomes
Remaining Questions
Do self-help groups or sickness benefits causally reduce treatment response, or do they merely correlate with pre-existing treatment resistance?
How do these predictors perform in other ME/CFS patient populations or with different treatment modalities?
What This Study Does Not Prove
This study does not prove that self-help groups, sickness benefits, or depression cause poor treatment outcomes—only that these factors are associated with worse results. The findings cannot establish whether these factors reflect resistance to treatment or whether other unmeasured variables explain the relationship. Results may not generalize to patients receiving other treatment types or to different healthcare systems.