Illness beliefs and treatment outcome in chronic fatigue syndrome, 1998, Deale, Chalder and Wessely

Discussion in 'Psychosomatic research - ME/CFS and Long Covid' started by Hutan, Apr 13, 2025.

  1. Hutan

    Hutan Moderator Staff Member

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    Abstract
    Longitudinal studies have shown that physical illness attributions are associated with poor prognosis in chronic fatigue syndrome (CFS). Speculation exists over whether such attributions influence treatment outcome.

    This study reports the effect of illness beliefs on outcome in a randomized controlled trial of cognitive-behavior therapy versus relaxation. Causal attributions and beliefs about exercise, activity, and rest were recorded before and after treatment in 60 CFS patients recruited to the trial.

    Physical illness attributions were widespread, did not change with treatment, and were not associated with poor outcome in either the cognitive-behavior therapy group or the control group.

    Beliefs about avoidance of exercise and activity changed in the cognitive behavior therapy group, but not in the control group. This change was associated with improved outcome.

    These findings suggest that physical illness attributions are less important in determining outcome (at least in treatment studies) than has been previously thought. In this study, good outcome is associated with change in avoidance behavior, and related beliefs, rather than causal attributions.

    https://www.sciencedirect.com/science/article/abs/pii/S002239999800021X
    paywall
    Edited to add: https://www.simonwessely.com/Downloads/Publications/CFS/88.pdf
     
    Last edited: Apr 13, 2025
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  2. Utsikt

    Utsikt Senior Member (Voting Rights)

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    Do we know what ‘outcome’ means here? What did they measure?
     
  3. alktipping

    alktipping Senior Member (Voting Rights)

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    They measured their own hubris and liked what they saw .
     
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  4. rvallee

    rvallee Senior Member (Voting Rights)

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    I literally have no beliefs. I am a universal agnostic. I don't even understand the concept of believing in something, it strikes me as quite silly (although I do understand and respect that for a lot of people this is definitely important) because how the hell would I just know the answer to complex questions? Makes zero sense to me. I know I'm weird about that.

    So this makes those long-standing claims so damn weird to me. I think I said it before, but I literally rate a complete zero on the usual checklist of stereotypes and psychosocial factors. Not a single one of them. Which doesn't even seem possible simply through chance, considering how most of them are completely generic, and the main factor (let's be honest here) literally has a 51% chance.

    I'm not a woman. Was not middle aged when I got ill. I did not have a severe acute illness before. Never had trauma, I couldn't even name a single 'traumatic' event in my life. Had and still have a great family. I did well at school. Comfortable middle class, enough to feel its freedom, but not too much that it screwed me up. And I definitely do not have beliefs, about anything, and I am probably one of the least biased people in the world. I don't even understand the idea of thinking I know the answer to things I don't understand, or about wanting specific answers to be correct. I don't want to intuitively guess stuff, I want to know stuff. How it really works. For real.

    But on the belief scale, I am definitely in the bottom 0.01%. I simply don't have any. It makes all those claims about my life experience sound completely clownish, especially considering how both (and oddly) specific and generic they are.
     
  5. Utsikt

    Utsikt Senior Member (Voting Rights)

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  6. Utsikt

    Utsikt Senior Member (Voting Rights)

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  7. Yann04

    Yann04 Senior Member (Voting Rights)

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    Same. My entire outlook on the world before getting ME was a sort of external world sceptic, moral non-realist, post-modernist and post-structuralist outlook.
    Basically a lot of buzzwords for saying everything is relative and we can’t even really know if there is anything real or such thing as objective truth.

    In a philosophical sense, my only belief is the we cannot know if literally anything is true because every information we have is shaped by our percetions which are in turn shaped by cognitive processes (whatever that means and that’s really upto debate).
     
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  8. Utsikt

    Utsikt Senior Member (Voting Rights)

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    15 is Oxford. 16 is this: https://pubmed.ncbi.nlm.nih.gov/1322076/
     
  9. Utsikt

    Utsikt Senior Member (Voting Rights)

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    This means that we have the issue of an unblinded trial with only subjective outcomes. This makes the results notoriously unreliable.
    There is no reason to not using objective measures like walking distance, employment, etc.
     
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  10. Utsikt

    Utsikt Senior Member (Voting Rights)

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  11. Trish

    Trish Moderator Staff Member

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    If I read this correctly, it seems that they found that what one believes about the cause of illness has no effect on the subjective outcomes of a CBT versus relaxation trial.
    And they found an association between some aspects of exercise avoidance beliefs and subjective outcomes. They admit this is only an association, and cannot say anything about causation.
     
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  12. Hutan

    Hutan Moderator Staff Member

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    The trial is even worse than that.
    An enormous amount of work was required from those in the CBT group.

    There were 13 sessions (CBT vs relaxation). There was homework in daily diaries.
    For CBT (which included GET):
    So, there was teaching on how to deal with distressing thoughts that would have impacted on how participants reported on their health in the followup period.
     
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  13. Utsikt

    Utsikt Senior Member (Voting Rights)

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    More from the trial:
    There were no attempts at blinding within the research team, even though only one of them acted as the therapist.
    The bolded part shows how the intervention might cause the participant to report that they can do more, regardless of any actual changes - because they have been told that that’s how things work and that that’s what they should expect to experience.
    Any doubts about the effectiveness of the treatment was labeled as unhelpful, and actively discouraged as a part of the treatment.
    Patients made action plans for how they would continue to convince themselves that they could do more after the treatment.

    The control group:
    The control group was seemingly not told how to think or behave.

    All in all, the contents of the intervention make the participant’s answers even more unreliable than what they already were as subjective reports.

    In short, it is fatally flawed.
     
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  14. Hutan

    Hutan Moderator Staff Member

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    The CBT group was younger (mean age 31), relaxation group (38).
    Illness duration was different (CBT 3.4 years....relaxation 4.6 years)

    More of the CBT group would have been in the onset range where natural recovery is common.

    Patient attribution of symptoms to physical illness was very different (CBT 57%.... relaxation 73%)

    I wonder about the exclusion - people with an inability to attend all of the sessions were excluded. That is an ambiguous exclusion, allowing the researchers potentially to exclude people who might have started and decided the intervention was not for them, and not mention them as drop outs. 8 people of the 147 who were screened were diagnosed with somatisation disorder and excluded.
    The CBT intervention was onerous, with non-symptom contingent GET. The people who got through to the end of the CBT intervention would have been a very select group. I suspect they would have included people who were probably already somewhat recovering at trial start, and wondering if they should be doing more activity.

    Table 2 lists the completers as CBT 27/30 and relaxation 26/30.
     
  15. Hutan

    Hutan Moderator Staff Member

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    I think the primary outcome was what we would call the SF-36 Physical Functioning scale.
    CBT: Pre-treatment 25.5; Post-treatment 56.2; 6 months 71.6
    Controls: Pre-treatment 27.8; post-treatment 34.6; 6 months 38.4

    We've talked before about the problems with SF-36. For many of us, it's hard to know how to answer a question about how easy it is to climb a flight of stairs. It would be very easy to change someone's frame of reference when it comes to answering those questions.

    I have to say, on the face of it, with the crucial exception of the subjective outcomes for an unblinded intervention that trains people to report better outcomes, the study is quite well done. And, although people in the CBT group weren't cured, there were significant reported improvements at 6 months.

    It is difficult to reconcile the results of this trial with what we know. It is surprising that the improvements continued for so long.

     
    Last edited: Apr 14, 2025
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  16. Hutan

    Hutan Moderator Staff Member

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    Here they imply that people who did not improve had an incentive to not report improvements.

    This is interesting. The results of the independent assessment at 3 months are not reported in any detail. This paragraph suggests that the blinded assessor may not have come up with such a clear benefit from the CBT.

    Here they note that not all researchers at this time were finding that the treatment was effective.
     
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  17. Hutan

    Hutan Moderator Staff Member

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    I can see how this study would be compelling for doctors and for people considering funding the PACE trial.

    For sure, the subjective self-report measures combined with what I would term manipulation, having seen that video by Chalder of an example therapy session would have affected responses. And it is really easy to think about things a bit differently to change the outcome of the SF-36 physical function score from the pre-treatment CBT score to the 6 months score.
    See here: What do people think of SF-36?
    And its findings were at odds with two other studies undertaken five or so years earlier.

    But, there was ongoing improvement after the therapy sessions, out to 6 months. How did they manage that? It seems so much at odds with what we know.

    I wonder if the participants had ongoing contact with Chalder? Did any of the participants in this study ever provide any commentary about it?

    Those two studies mentioned as not finding CBT effective are interesting:
    There are some very recognisable names on those papers. They would be worth a closer look.
     
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  18. Utsikt

    Utsikt Senior Member (Voting Rights)

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    Oh, that’s easy:
    From the SF36 thread:
    https://www.s4me.info/threads/what-do-people-think-of-sf-36.31504/page-5
     
  19. Arvo

    Arvo Senior Member (Voting Rights)

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    That fits with the theoretical idea at the time, when they first started to promote CBT for ME as treatment: that the treatment was cost-effective as it would have ongoing positive effect; they would help the patient over the first bump, after which the improvement would go on because of the Operant Conditioning (so basically the ongoing discovery that continuing activity while feeling sick worked and getting positive reward, expanded activity ability, from it) and the patient having been taught to "correct" their wrong cognitions when they occured.

    See Sharpe et al, published just the year before. They also saw ongoing improvement after 4 months, 16 sessions, of CBT:
    "Evaluations took place before randomisation, after the initial treatment period (five months), at eight months, and, finally, at 12 months after entry.":

    Schermafbeelding 2025-04-14 105426.png
     
  20. Evergreen

    Evergreen Senior Member (Voting Rights)

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    I have often wondered about these early studies. Fulcher and White 1997 is similarly promising - the exercise group had a 20 point increase in SF36 PF score at 12 weeks (compared to 8 point increase in the control group). Compare this to the GET group in PACE who had an increase of about 11 points at 12 weeks. Though none of the PACE arms got to the 72 reported for CBT in Deale et al. 1997.

    My interpretation is referral/selection bias: these were small studies with 30-ish people per group who had been referred to psychiatrists/CBT therapists with fatigue. While those with current psychiatric disorders were excluded from Fulcher and White, and those with severe depression or somatization disorder were excluded from Deale et al. 1997, I suspect that the group of patients they saw, and see, is quite different to the group of patients who would be referred by their GP to, say, an infectious disease doctor or an immunologist.

    The booklet for Chalder and Wessely's clinic can be downloaded here:
    https://www.yumpu.com/en/document/v...atigue-service-booklet-slam-national-services

    There are two case studies/testimonials at the back, written by patients who benefitted. I don't identify with them at all. I did not benefit from CBT or GET.
     
    Last edited: Apr 18, 2025
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