title: Frequency and determinants of nonpublication of research in the stroke literature.
abstract: OBJECTIVE
  Selective nonpublication will yield publication bias and a published literature imperfectly representative of the full range of scientific findings. We evaluated the proportion of research abstracts presented at the leading United States research meeting in stroke, the International Stroke Conference (ISC), which were subsequently published as full-length articles and investigated the factors associated with full manuscript publication.
  
  
  METHODS
  Features of all abstracts presented at the annual ISC meeting in February 2000 were analyzed. Search of the National Library of Medicine PubMed database and written communication with abstract authors was performed to determine conversion of abstracts to fully published manuscripts over the subsequent 5 years.
  
  
  RESULTS
  Among the 353 abstracts presented at the 2000 International Stroke Conference, 108 were oral presentations and 245 posters. Overall, 202/353 (62.3%) resulted in full-length publications, with a median time to publication of 15 months. In multivariate analysis, factors increasing likelihood of full-length publication were: platform rather than poster presentations (odds ratio [OR] 3.0, 95% CI, 1.6 to 5.5), authors with a university affiliation (OR 2.2, 95% CI, 1.2 to 4.1), and European region of origin (OR 2.2, 95% CI, 1.1 to 4.4), whereas topic concerning community/risk factors decreased the likelihood of publication (OR 0.3, 95% CI, 0.16 to 0.74). Positive results, multicenter collaboration and industry sponsorship did not affect publication rate.
  
  
  CONCLUSIONS
  Approximately 1 of every 3 abstracts presented at an international stroke meeting was not published as a full manuscript within 5 years. Poster abstracts were less likely to be published in full manuscript form than oral presentations.
authors.affiliation: University of California at Los Angeles Stroke Center, Calif, USA. sanossia@yahoo.com
authors.forename: Nerses
authors.initials: N
authors.lastname: Sanossian
authors.forename: Arbi G
authors.initials: AG
authors.lastname: Ohanian
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Saver
authors.forename: Linda I
authors.initials: LI
authors.lastname: Kim
authors.forename: Bruce
authors.initials: B
authors.lastname: Ovbiagele
mesh_terms: D000043:Abstracting and Indexing / Q000706:statistics & numerical data; D001319:Authorship; D015706:Bibliometrics; D002986:Clinical Trials as Topic / Q000706:statistics & numerical data; D003226:Congresses as Topic / Q000706:statistics & numerical data*; D006801:Humans; D038622:Internationality; D015337:Multicenter Studies as Topic / Q000706:statistics & numerical data; D009462:Neurology; D010380:Peer Review; D010506:Periodicals as Topic / Q000706:statistics & numerical data; D011643:Publishing / Q000706:statistics & numerical data*; D012107:Research Design / Q000706:statistics & numerical data; D012109:Research Support as Topic / Q000706:statistics & numerical data; D020521:Stroke; D011795:Surveys and Questionnaires; D013997:Time Factors; D014481:United States