The AllTrials campaign is calling for all past and present clinical trials to be registered and their full methods and summary results to be reported. To demonstrate why this matters, they have a Clinical trial publishing game, from The Economist.
The results of around half of all clinical trials have never been published. Failing to publish results means the people who make decisions about medicines don’t have full information about the benefits and risks of treatments we use every day.
Go have a play. It’s amazing how much you can skew your results by not publishing the weaker results.