In November 2024, we published the substantially updated Cochrane Methodology Review of studies of publication bias, covering both non-publication of results and time to publication. This replaces two earlier review and it includes a total of 204 research reports tracking 165,135 trials. The review shows that just over half (53%) the trials were published in full. The median time to publication was approximately 4.8 years from the enrollment of the first trial participant and 2.1 years from the trial completion date.

The review is available at https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.MR000011.pub3/full and you can listen to the lead author's podcast at https://www.cochrane.org/podcasts/10.1002/14651858.MR000011.pub3