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They don't seem to report any between group difference and tests, only within groups? That approach is usually a sign that the results were not what they wanted them to be...

I assumed nobody would take these results seriously as indicating a real effect but Suzanne Vernon wrote on the Bateman Horne clinic website: https://batemanhornecenter.org/promising-clinical-trials/

Yates's correction for continuityQuite a few patients scored a value of 0 at baseline or follow-up which seems weird given that these were the completer's analysis, so 0 doesn't indicate missing data. The abstract writes: 'A greater proportion of subjects in the oxaloacetate group achieved a...

The intervention arm included dietary advice and symptom-contingent exercise. They write: "A symptom-titrated pacing strategy was implemented to account for exercise intolerance or PEM." The control group received standard physiotherapy. Unfortunately, it seems that there were no significant...

Had a look at the data and the group difference was 0.81 [95% confidence interval: -1.32 to 2.94], with a t-test p-value of 0.449. The cohen d effect size is 0.19 [-0.30, 0.68]. So nothing to see here unfortunately.

'a gradual increase in activity helps people recover.' 'This new research provides evidence for treatments that will help people recover, and is consistent with the approach the Oslo Networks understanding of these conditions.' Signed by Paul Garner who was one of the authors of the BMJ review.

It seems to highlight similar problems as ours: Hoping that the editors take notice.

I interpreted the statement as highlighting current problems with ME/CFS case definitions, so more a starting point for discussion than a specific proposal on how things should be. I think the required impairment for ME/CFS diagnosis, definition of PEM, and exclusionary conditions are good...

The MCAM did test their methods first to check if it correlated with the gold standard of chromium-51 release tested on whole blood on the same day. https://pubmed.ncbi.nlm.nih.gov/33819446/

It also seems that the authors have included multiple estimates from the same study (for example different E:T ratios). I don't think their modelling accounts from the correlation between these, so it is similar to counting some studies multiple times.

12 out of the 28 studies in the review came from the same research team as the reviewers at Griffith University. There are also 4 from the Klimas group in Florida who previously advocated this line of research. Other studies are rather old, from before 2000.

I don't think these estimates are useful. The authors have thrown 2 case studies with less than 10 participants and no control group in the mix. This entirely messes up the meta-analysis. The only 2 randomized studies are the PACE trial and this small Belgian study...

We have written a blog article that summarizes the problems with the BMJ review on Long Covid interventions (Zeraatkar et al. 2024). Inconsistency in how imprecision was evaluated seems to be the key issue. Suspect that a correction will be needed...

Been looking closer into this. One interpretation might be that including all randomized participants is assuming that those with missing data did not had the outcome (in our example improvement/recovery), so a form of imputation (non-responder imputation). Cochrane seems to recommend not...

Intention to treat In the protocol the authors said they were going to use intention-to-treat (ITT): "reviewers will preferentially extract the results from intention-to-treat analyses without any imputations for missing data, when reported." But if you look at the data they extract in the Excel...

A minus sign I think. the - before the 13.11 got accidentally deleted when I made the table. The estimate is −8.4, 95% confidence interval (CI) −13.11 to −3.69. So it is above the MID of 3 points and does not cross 0. I assume this is what you referred to? Apologies for the confusion (will...

Here's why I'm asking about precision: the outcomes above that were downgraded twice were non-behavioral interventions with low risk of bias. Those what were not downgraded were rehabilitative interventions and all high risk of bias. So because of this weird approach to evaluating precision...

Imprecision I think there is an issue with how they evaluated (im)precision and was hoping if anyone could double-check. In short, precision is determined by the variation in the measurement (e.g. standard deviation) and the amount of information collected (sample size). In the protocol the...

Meta-epidemiological evidence that randomization and allocation concealment overestimate treatment effects is also weak. Take for example this latest overview where Guyatt was senior author and where the overestimation because of lack of blinding was actually bigger than for randomization and...

GRADE is getting a big update and some parts are already available in this new book: https://book.gradepro.org/ Unfortunately, it includes the following passage: The meta-epidemiological evidence refers to the MetaBLIND study. This might explain why reviewers (such as those that wrote the...