Ramsey 1995.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE; date of search not reported Person completing the search not reported Searched by all authors Matching criteria not reported
Data	Included 249 abstracts presented at the 1991 American Association of Blood Banks meeting Included all abstracts
Comparisons	Proportion of abstracts published Oral versus poster presentation Commercial versus non‐commercial versus mixed vendors Subspecialty Origin
Outcomes	89 of 249 abstracts published Proportion of abstracts published by time not reported Factors related to proportion of abstracts published included 51% of abstracts presented orally versus 23% of abstracts presented as posters published 18% of abstracts with 'commercial venders' versus 38% of abstracts with 'non‐commercial sources' versus 44% of abstracts with 'commercial/non‐commercial collaborations' published Reported that 'Publication rate was not influenced by abstract category or foreign origin.'
Notes	Hematology ‐ transfusion medicine, blood bank Funding not reported Data extracted from abstract
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts.
Search for publications?	No	Searched only 1 database.
Follow‐up time?	Unclear	Date of search not reported.
Matching?	Unclear	Matching criteria not reported.
Adjustment for confounding?	No	Examined association of type presentation, funding, subspecialty and country of origin with publication using stratified analysis.