I have looked through it and am not impressed.
305 patients diagnosed with Oxford criteria. 219 completed all the assessments including 1 year follow up.
Assessments were done by self-reports prior to the first consultation, 1 week before and 1 week after the intervention program, and at 3 months and 1 year after the intervention.
A subgroup fulfilling the inclusion criteria from the PACE study (Chalder Fatigue Scale >6/11, SF-36 Physical functioning <65/100)
148 patients fulfilled PACE entry criteria
All patients were also examined according to the CDC (1994) case definition of chronic fatigue syndrome (
32). In accordance with CFS-CDC case definition, comorbid conditions of mild to moderate depression or anxiety were allowed. A subgroup of patients with CFS (CDC) was defined.
'Clinically significant' improvement was defined as at least half a standard deviation, which meant improvement on CFQ of 2 and on SF-36 of 7 points.
54 patients Oxford only,
46 of these gave 1 year follow up data
39 of these improved on CFQ from baseline,
Mean CFQ drop of 8.1 in 1 year
36 improved on SF36 PF from baseline.
Mean SF36 PF increase of 20.4
94 CDC criteria as well as Oxford,
68 of these gave 1 year follow up data
62 improved on CFQ from baseline,
Mean CFQ drop of 10.8 in 1 year
Mean SF36 PF increase of 29.2
59 improved on SF36 PF from baseline.
Graphs for the whole group suggest that a third of the improvement happened between initial interview (which included lifestyle advice and an 'explanation' of their symptoms) and starting the 4 day treatment program, and the rest of the improvement happened during the 4 days, with scores slipping back a bit in the year following the treatment.
Given the huge loss to follow up, the brainwashing effect of the treatment on how to perceive the illness and symptoms that will greatly influence the outcomes, the lack of a control group and the subjective outcome measures, I don't think anything can be concluded from this trial.
The claim that 80 to 90 percent of participants showed clinically significant improvement is nonsense for several reasons:
1. Less than 72% gave 1 year follow up data. The figure should have been calculated for all those treated, which would reduce the proportion showing 'improvement' to about 55 to 65% of the patients.
2. 'Clinically significant' improvement was defined as at least half a standard deviation, which meant improvement on CFQ of 2 and on SF-36 of 7 points.
This is clearly nonsense - a little persuasion can make a much bigger change than this without any objective change.
3. Given that practically all the 'improvement' shown on the questionnaires happened over the treatment days, any suggestion that it is unhelpful beliefs leading to deconditioning that is perpetuating symptoms is nonsense. A daily walk for 4 days isn't going to reverse years of alleged deconditioning, and if patients continued these daily walks for the year after treatment, how come their SF36PF got a bit worse over the rest of the year.
4. Similarly if it is 'central sensitisation' that is perpetuating ME, and this is a physical phenomenon in the brain, how can 4 exhausting days of listening to talks doing CBT, meditating and being made to go on long walks magically reverse this. And if it did, how come the patients haven't fully recovered?
Surely what this trial 'proves' if anything, is that ME is not caused or perpetuated by deconditioning (or by central sensitisation).