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Some drug studies more likely to have favorable conclusions
Date:11/16/2007

Previous work has shown that, when a drug study was funded by the company that made that drug, the results might be biased in favour of that drug because the methods or analyses were manipulated.

New research published on bmj.com today shows that, for blood pressure drugs, studies are now much less likely to have biased results but still tend to have overly positive conclusions favouring the company's products.

The authors call on editors and peer reviewers to scrutinise the conclusions of these studies to ensure that they contain an unbiased interpretation of the results.

Meta-analyses represent the highest level of research evidence in the hierarchy of study types. They pool data from multiple studies to provide summary statistics on the effectiveness of a given treatment. They have a great deal of influence on patient care and healthcare policy and drug companies have started to reference meta-analyses in their advertisements.

Previous studies have shown that randomised controlled trials with financial ties to single drug companies are more likely to have results and conclusions that favour the sponsors products, and a recent study suggests that the same holds true for meta-analyses.

So researchers in the US set out to determine whether financial ties with single drug companies are associated with favourable results or conclusions in meta-analyses on blood pressure lowering (antihypertensive) therapies.

A total of 124 meta-analyses were included in the study, 49 (40%) of which had single drug company financial ties. Differences in study design and quality were measured.

Meta-analyses with single drug company financial ties were not associated with favourable results but were significantly more likely to have favourable conclusions, even when differences in study quality were taken into account.

In fact, the data show that studies funded by a single drug com
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Contact: Emma Dickinson
edickinson@bmj.com
44-020-738-36529
BMJ-British Medical Journal
Source:Eurekalert

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