title: Full-text publication of abstracts presented at European Orthodontic Society congresses.
abstract: BACKGROUND
  Empirical evidence has indicated that only a subsample of studies conducted reach full-text publication and this phenomenon has become known as publication bias. A form of publication bias is the selectively delayed full publication of conference abstracts. The objective of this article was to examine the publication status of oral abstracts and poster-presentation abstracts, included in the scientific program of the 82nd and 83rd European Orthodontic Society (EOS) congresses, held in 2006 and 2007, and to identify factors associated with full-length publication.
  
  
  METHODS
  A systematic search of PubMed and Google Scholar databases was performed in April 2013 using author names and keywords from the abstract title to locate abstract and full-article publications. Information regarding mode of presentation, type of affiliation, geographical origin, statistical results, and publication details were collected and analyzed using univariable and multivariable logistic regression.
  
  
  RESULTS
  Approximately 51 per cent of the EOS 2006 and 55 per cent of the EOS 2007 abstracts appeared in print more than 5 years post congress. A mean period of 1.32 years elapsed between conference and publication date. Mode of presentation (oral or poster), use of statistical analysis, and research subject area were significant predictors for publication success.
  
  
  CONCLUSIONS
  Inherent discrepancies of abstract reporting, mainly related to presentation of preliminary results and incomplete description of methods, may be considered in analogous studies.
  
  
  CONCLUSIONS
  On average 52.2 per cent of the abstracts presented at the two EOS conferences reached full publication. Abstracts presented orally, including statistical analysis, were more likely to get published.
authors.affiliation: *Department of Orthodontics, University of Groningen, University Medical Centre Groningen , the Netherlands, c.livas@umcg.nl.
authors.forename: Christos
authors.initials: C
authors.lastname: Livas
authors.affiliation: **Department of Orthodontics and Dentofacial Orthopaedics, University of Bern, Bern, Switzerland, ***Private Practice, Corfu, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Pandis
authors.affiliation: *Department of Orthodontics, University of Groningen, University Medical Centre Groningen , the Netherlands.
authors.forename: Yijin
authors.initials: Y
authors.lastname: Ren
mesh_terms: D000043:Abstracting and Indexing; D015706:Bibliometrics; D003226:Congresses as Topic; D016206:Databases, Bibliographic; D018865:Dental Research / Q000145:classification; D005060:Europe; D006801:Humans; D009970:Orthodontics; D010506:Periodicals as Topic; D057175:Posters as Topic; D039781:PubMed; D011643:Publishing; D012953:Societies, Dental; D013997:Time Factors