Andy
Retired committee member
Note: this is from 2016. It's new to me but may be familiar to others.
Article in the Guardian, again from 2016.
Paywalled at http://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(15)00545-3/abstractSummary
The recent National Institute for Health and Care Excellence guidelines for bipolar disorder offer a number of recommendations for the psychological treatment of bipolar disorder. Scrutiny of the evidence on which these guidelines are based reveals significant flaws in the methodology and conduct of the relevant meta-analyses, and calls into question the interpretation of the evidence.
Article in the Guardian, again from 2016.
https://www.theguardian.com/science...ychological-therapy-cbt-overstepping-evidenceIn our paper published in Lancet Psychiatry, we re-assess the evidence used by NICE to recommend psychological therapies as an intervention for bipolar disorder. The diagnosis of bipolar disorder typically describes a cycling between periods of depression and mania (where the latter may involve grandiose ideas, increased drive and decreased sleep, which can all culminate in psychosis and exhaustion if untreated).
NICE guidance positions psychological interventions as the first line treatment for adults who are not in secondary care, and places them on an equal-footing with pharmacological treatments in the longer-term management of the disorder. In these circumstances, we might expect the underpinning evidence to be of the highest quality.
As with all NICE guidelines, the recommendations are based on reviewing trial data using meta-analysis: in this case they commissioned the National Collaborating Centre for Mental Health to do the analyses (NCCMH). The purpose of such meta-analyses is to collate data across multiple trials so we can draw more reliable conclusions about the efficacy of specific interventions.
Perusing the documentation, however, the reader will be struck by the sheer quantity of meta-analyses conducted by NCCMH - 170 meta-analyses assessing multiple psychological therapies and outcomes across just 55 trials. Consequently, each meta-analysis contains very few trials – indeed, the largest they present contains 6. More worryingly, and contrary to the purpose of meta-analysis, which is to synthesize studies, more than 50% of all meta-analyses in the NICE guide include only one trial. It would not escape the attention of someone with basic statistical knowledge that such an approach is likely to elicit false-positive findings by chance alone.