Cauchy 2014.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed up to June 30, 2013 Person completing the search not reported Searched by first and last author, and keywords Matched abstract to full‐length publication by Sample size Title Results Type of study Conclusions
Data	Included 897 abstracts submitted to the 2005 to 2012 French Congress of Digestive and Hepato‐biliary Surgery meetings Included all abstracts
Comparisons	Proportion of abstracts published Median time to publication, overall and by presentation status 'Positive' versus not 'positive' Sample size <100 versus >100 Accepted versus rejected abstracts Oral versus poster presentation Clinical research versus 'experimental' research RCT design versus observational design versus case report design versus literature review versus meta‐analysis Multi‐centered versus single center French versus rest of the world origin Plenary versus other oral presentation Subspecialty
Outcomes	334 of 897 abstracts published Proportion of abstracts published by time Median time to publication = 16.1 months (range = 0 to 67.4 months), overall Median time to publication = 16.1 months for accepted abstracts Median time to publication = 15.1 months for rejected abstracts Factors related to proportion of abstracts published included 245/580 'positive' (undefined) versus 89/317 not 'positive' abstract results published 227/624 abstracts with <100 participants versus 107/273 abstracts with <100 participants published 219/453 accepted abstracts versus 115/444 rejected abstracts published 109/176 abstracts presented orally versus 110/277 abstracts presented as poster published 309/857 abstracts describing clinical research versus 25/40 abstracts describing 'experimental' research published 6/8 abstracts with RCT design versus 316/825 abstracts with observational design versus 7/57 abstracts with case report design versus 2/4 abstracts describing literature reviews versus 3/3 abstracts describing meta‐analyses published 35/69 abstracts with multiple centers versus 299/832 abstracts with a single center published 301/716 abstracts from France versus 33/181 abstracts with rest of the world origin published 22/29 abstracts presented in the plenary versus 109/176 other orally presented abstracts published
Notes	Gastroenterology ‐ digestive and hepato‐biliary surgery Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts.
Search for publications?	No	Searched only 1 database.
Follow‐up time?	No	The meeting only had 24 months follow‐up.
Matching?	Yes	Matched by 5 different criteria.
Adjustment for confounding?	Yes	Examined association of positive results, sample size, acceptance for presentation, type of presentation, type of science, study design, multi‐center status, French origin, type of oral presentation, and subspecialty with publication using multivariable logistic regression analysis.