Table 2.

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.