Maybe there is a subgroup of CFS patients suffering from "health anxiety/hypochondriasis", but this seemed a frustratingly pointless read.
Even if the questionnaires were all accurately measuring what they were intended measure, problems with the design would still make it pointless. As it is, there's no real reason to believe that the questionnaires are accurately measuring what is intended.
This bit stood out re CFQ:
The 11-item Chalder fatigue questionnaire (Chalder et al., 1993) measures physical and mental fatigue. Reliability and validity of this measure is supported in CFS/ME (Deale, Chalder, Marks, & Wessely, 1997). The 0-3 scoring method was used as it is considered more sensitive to change.
Ignoring what they mean by 'supported' (as the cited paper doesn't show much), I wonder why they they said the 0-3 scoring was more sensitive to change?
In addition to the standard battery of questionnaires, the 14-item Short Health Anxiety Inventory (SHAI) (Salkovskis, Rimes, Warwick, & Clark, 2002) was included for the purposes of this study. This measure was deemed the most suitable measure to assess health anxiety due to the robust theoretical basis of the measure, with items directly derived from the evidence-based empirically-grounded clinical model of health anxiety (Salkovskis et al. 2003), aligning with the now commonly accepted anxiety foundation of health anxiety/hypochondriasis (rather than somatization or more generic underpinnings seen in other similar measures; see Salkovskis et al. 2002). According to the original paper, the conceptual construct of health anxiety is based on the principle that distress arises due to an enduring predisposition to
misinterpret ambiguous normal bodily variations or physiological stimuli as indicators of physical illness (which may also extend to medical information) resulting in the employment of behaviours which serve to maintain rather than reduce distress. The items relate directly to the specific dimensions of the cognitive model as set out in Salkovskis et al.(2003), including preoccupation with health concerns, vigilance to bodily sensations, interpretation of ambiguous physical sensations and disbelief in medical reassurance. The original paper utilised standard deviations of normative data to produce clinical cut-offs to indicate case (>18) and non-case levels of health anxiety and differentiate generic anxiety. Subsequent studies and reviews have established test-retest reliability, concurrent, convergent and discriminant validity of the SHAI (Hedman et al. 2015, Daniels et al. 2017). Overall internal consistency of the measure is very good (α = .89) (Rabiei, Kalantari, Asgari, & Bahrami, 2013; Salkovskis et al., 2002) and the measure has also been demonstrated as reliable in CFS/ME (α =.89) (Daniels et al., 2017) and other medical conditions (Tyrer et al. 2011).
I wonder if there are any reasons CFS patients might tend to have disbelief in medical reassurance? Perhaps it's not a great sign of "health anxiety/hypochondriasis"?
This paper completely ignores the disturbing social and historical context surrounding CFS, and the way this could affect how patients respond to these questionnaires.
Details on this questionnaire here:
https://www.kcl.ac.uk/ioppn/depts/p.../cadat/research/health-anxiety-questionnaires.
I went through thinking about what sort of statements someone suffering from serious problems with CFS could agree with. I think these statements need not show any real problem with health anxiety/hypochondriasis (though a lot depends on how you define things like 'often' or 'much of the time' - is four times a week often or much of the time?):
I spend much of my time worrying about my health.
I am aware of aches/pains in my body all the time.
I am often aware of bodily sensations or changes.
Most of the time I can resist thoughts of illness.
I am often afraid that I have a serious illness. [Is CFS assumed to be a serious or not serious illness?]
I frequently have images of myself being ill.
I often have difficulty in taking my mind off thoughts about my health.
I am not relieved if my doctor tells me there is nothing wrong.
If I hear about an illness I sometimes think I have it myself.
If I have a bodily sensation or change I always wonder what it means.
I usually feel at high risk for developing a serious illness. [Is CFS assumed to be a serious or not serious illness?]
I usually think that I am seriously ill. [They are!]
If I notice an unexplained bodily sensation I often find it difficult to think about other things.
My family/friends would say I have a normal attitude to my health.
That would lead to a score of 28. Even if you remove the questions where I assumed suffering from serious CFS would mean that they worried about suffering from/developing a serious illness, and instead that they did not worry about that at all, that would still leave them with 22 points.
a score of >18 was used as a cut off for definite cases of health anxiety
I'm not sure that 'definite' is the right word there.
There's so much stuff like this in here:
Physical functioning accounted for 20.7% of the variance of fatigue, supporting current theories of a relationship between these factors and established clinical notions, suggesting that reduced physical activity may perpetuate and exacerbate fatigue during activity as seen in other conditions such as arthritis (Hegarty et al., 2015).
So an association between how individuals with CFS fill in fatigue and physical functioning questionnaires suggests that "reduced physical activity may perpetuate and exacerbate fatigue during activity"? What conditions where people suffer from disabling levels of fatigue do not show such an association?
Am I missing something here? I now have such low expectations for Daniel's work that I worry I might be slipping into assuming too little of her.
Edit: I should mention that the assessment of their health anxiety intervention was based on questionnaire scores from 10 people, with no control group. If that's research that interests you, feel free to check out the details in their paper.
Limitations and future research
A proportion of clinicians and patients within the prevalence study expressed scepticism relating to the SHAI, which may have subjected recruitment to selective bias from clinicians with positive/neutral views of the SHAI, leaving opportunity for inadvertent sampling bias of psychologically receptive participants only.
Yeah, you'd have to be pretty odd to want to be a part of Daniel's work.
That she was appointed to the NICE committee shows the quality of thought they think we deserve.