For the study period, a total of 18175 authors were opted-in to transparent peer review on submission and 15586 authors remained opted-in, i.e. 86% of authors. A small proportion of authors (244) changed their mind about their preference of peer review model when submitting a revised version with 57% wanting to adopt transparent peer review. The majority of reviewers preferred to be anonymous with only 15% signing their reviews.
Overall, submissions to journals adopting transparent peer review and control journals did not change during the study period, both journal groups had increased submissions (Figure 2).