Boldt 1999.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE from 1993 to 1999 Person completing the search not reported Search criteria not reported Matched abstract to full‐length publication by All authors Contents
Data	Included 566 abstracts presented at the 1994 Deutscher Anesthäsie Kongress and European Society of Anaesthesiologists meetings Included all abstracts of free papers
Comparisons	Proportion of abstracts published, overall and by meeting Cumulative proportion of abstracts published by meeting Oral versus poster presentation
Outcomes	233 of 566 abstracts published 111/244 abstracts presented at the 1994 European Society of Anaesthesiologists meeting, and 122/322 at the 1994 Deutscher Anesthäsie Kongress meeting published Proportion of abstracts published by time Cumulative proportion of abstracts published at 84 months showed proportion published = 37.9% (122/322 abstracts) for Deutscher Anesthäsie Kongress Cumulative proportion of abstracts published at 84 months showed proportion published = 45.5% (111/244 abstracts) for European Society of Anaesthesiologists Factors related to proportion of abstracts published included 137/349 abstracts presented orally versus 96/217 abstracts presented as posters published
Notes	Anesthesiology Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts of free papers.
Search for publications?	No	Searched only 1 database.
Follow‐up time?	Yes	The meeting had 5 years follow‐up.
Matching?	Yes	Matched by 2 different criteria.
Adjustment for confounding?	No	Examined association of meeting year and type presentation with publication using stratified analysis.