Livas 2014.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed and Google/Google Scholar in April 2013 Search completed by the investigators Searched by first, second, and last author, keywords, and title Matched abstract to full‐length publication by All authors Title Study design Conclusions
Data	Included 590 abstracts presented at the 2006 and 2007 European Orthodontic Society meetings Included all abstracts except keynote lectures
Comparisons	Proportion of abstracts published, overall and by meeting Mean time to publication, overall and by meeting Cumulative proportion of abstracts published 'Positive' versus not 'positive' versus no statistical testing Oral versus poster presentation European versus Asian versus rest of the world origin Academic affiliation versus public health service affiliation versus other governmental affiliation versus private practice affiliation versus private company affiliation Subspecialty
Outcomes	308 of 590 abstracts published 168/333 abstracts presented at the 2006 meeting, and 140/257 at the 2007 meeting published Proportion of abstracts published by time Mean time to publication = 15.8 months, overall Mean time to publication = 17.2 months for 2006 European Orthodontic Society meeting Mean time to publication = 14.6 months for 2007 European Orthodontic Society meeting Cumulative proportion of abstracts published at 60 months showed proportion published = 51.4% (303/590 abstracts) Factors related to proportion of abstracts published included 201/340 'positive' (not defined) versus 81/145 not 'positive' abstract results versus 26/105 abstracts without statistical testing published 115/162 abstracts presented orally versus 193/428 abstracts presented as poster published 203/390 abstracts originating from Europe versus 88/172 abstracts originating from Asia versus 17/28 abstracts from the rest of the world published 286/545 abstracts originating in an academic center versus 5/8 abstracts originating from a public health service versus 8/13 abstracts originating from other governmental institution versus 6/21 abstracts originating from private practice versus 3/3 originating from a private company published
Notes	Oral health ‐ orthodontics Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts with reasonable exceptions.
Search for publications?	Yes	Searched 2 databases.
Follow‐up time?	Yes	All meetings had at least 6 years follow‐up.
Matching?	Yes	Matched by 4 different criteria.
Adjustment for confounding?	Yes	Examined association of meeting year, positive results, type of presentation, country of origin, academic affiliation, and subspecialty with publication using multivariable logistic regression analyses.