As you can see from the above image the ‘Ongoing clinical trials’ filter shows 14 closed trials (these are trials that are no longer recruiting) and that there are 8 controlled trials. So, we can spot a shortfall of 6. So, is that an issue? It can be as it can suggest hidden trails, which are never a good thing. I had a superficial look and found a couple of things of interest:
- A number of the closed trials were halted for ‘administrative’ reasons. I’m not sure how satisfactory that is.
- Our controlled trials are identified via a filter and this has over-identified controlled trials and there are only actually 6 controlled trials in our index. So, while we over-identified some, we possibly under-identified others.
Irrespective of the above points Trip makes it incredibly easy to spot potential publication bias. If you’re interested in unbiased evidence this feature alone is very useful!