|Characteristics||No (%) of untagged records (n=19)||No (%) of tagged records (n=16)|
|Quasirandomised trial||1 (5)||2 (13)|
|Meta-analysis or review||3 (16)||2 (13)|
|RCT briefly mentioned||8 (42)||0 (0)|
|Unrelated to RCT or CCT||7 (37)||12 (75)|
CCT=controlled clinical trial.
*Untagged records (19/591) were originally identified by Cochrane searchers as RCTs, but are classified here as non-RCTs. Tagged records (16/594) were indexed by the US National Library of Medicine as RCTs but are classified here as non-RCTs.