Fig. 2

The minimum and maximum time to publication were 0.87 and 56 months. The median was 16.3 months. The average was 19.9 months. *The time (in months) from protocol registration to publication of SRs was defined as the number of days from registration to publication divided by 30. The date of publication was selected for each review according to the following hierarchy: (1) the acceptance date, if available; (2) the online publication date, if available; (3) the earlier of the journal publication date or the date of author-reported “published” status in PROSPERO; (4) the earlier of the journal publication date of a conference abstract or the documented date of public poster dissemination detected by searching Google or Google Scholar. If only the publication month was reported, the midpoint of that month (day 15) was set as the publication day