Number of retrospectively registered trials and prevalence of key retrospective registration reporting practices
| n | % (of total) | |
| Total: retrospectively registered trials | 956 | 100.0% |
| Registration reported | 783 | 81.9% |
| Registration number reported | 779 | 81.5% |
| In abstract | 325 | 34.0% |
| In full text | 535 | 56.0% |
| In other* | 134 | 14.0% |
| Registration date reported | 67 | 7.0% |
| In abstract | 45 | 4.7% |
| In full text | 32 | 3.3% |
| Retrospective registration addressed | 47 | 4.9% |
| In abstract | 21 | 2.2% |
| In full text | 33 | 3.5% |
| Retrospective registration justified/explained | 20 | 2.1% |
| In abstract | 0 | 0.0% |
| In full text | 20 | 2.1% |
*‘Other’ includes footnotes, sidebars, etc.