title: ICMJE authorship criteria are not met in a substantial proportion of manuscripts submitted to Biochemia Medica.
abstract: BACKGROUND
  Our aim was to investigate if: (a) authors of Biochemia Medica meet authorship criteria given by International Committee of Medical Journal Editors (ICMJE), (b) authorship violations are more frequent in submissions containing some type of scientific misconduct.
  
  
  METHODS
  Self-reported authorship contributions regarding the three ICMJE criteria were analysed for all submissions to Biochemia Medica (February 2013-April 2015) which were forwarded to peer-review. To test the differences in frequencies we used Chi-squared test. P<0.05 was considered statistically significant.
  
  
  RESULTS
  186 manuscripts were authored by 804 authors. All ICMJE criteria were met by 487/804 (61%) authors. The first and the last author met all the criteria more frequently than those authors in between (P<0.001). The degree to which ICMJE criteria was met for the first author did not differ between manuscripts authored by only one author and those authored by >1 author (P=0.859). In 9% of the manuscripts ICMJE criteria were not met by a single author. Authors of the 171/186 manuscripts declared that all persons qualify for authorship but only 49% of them satisfied all ICMJE criteria. Authors have failed to acknowledge contributors in 88/186 (47%) manuscripts; instead these contributors have been listed as authors without fulfilling ICMJE criteria. Authorship violation was not more common in 42 manuscripts with some type of scientific misconduct (P=0.135).
  
  
  CONCLUSIONS
  Large proportion of authors of the manuscripts submitted to Biochemia Medica do not fulfil ICMJE criteria. Violation of authorship criteria is not more common for manuscripts with some type of scientific misconduct.
authors.affiliation: Biochemia Medica , Zagreb, Croatia ; Clinical Department for Laboratory Diagnostics, Clinical Hospital Centre Rijeka, Rijeka, Croatia ; Department of Medical Informatics, Rijeka University School of Medicine, Rijeka, Croatia.
authors.forename: Vesna
authors.initials: V
authors.lastname: Šupak-Smolčić
authors.affiliation: Clinical Department for Laboratory Diagnostics, Clinical Hospital Centre Zagreb, Zagreb, Croatia.
authors.forename: Ana
authors.initials: A
authors.lastname: Mlinarić
authors.affiliation: Clinical Department for Laboratory Diagnostics, Clinical Hospital Centre Rijeka, Rijeka, Croatia.
authors.forename: Dragana
authors.initials: D
authors.lastname: Antončić
authors.affiliation: Clinical Department for Laboratory Diagnostics, Clinical Hospital Centre Zagreb, Zagreb, Croatia.
authors.forename: Martina
authors.initials: M
authors.lastname: Horvat
authors.affiliation: Department of Clinical Laboratory Diagnostics, University Hospital Centre Osijek, Osijek, Croatia.
authors.forename: Jelena
authors.initials: J
authors.lastname: Omazić
authors.affiliation: Biochemia Medica , Zagreb, Croatia ; University Department of Chemistry, University Hospital Centre Sestre milosrdnice, Zagreb, Croatia.
authors.forename: Ana-Maria
authors.initials: AM
authors.lastname: Šimundić
mesh_terms: D001319:Authorship / Q000592:standards*; D003625:Data Collection; D035081:Editorial Policies; D007390:International Agencies / Q000592:standards*; D008373:Manuscripts as Topic; D010506:Periodicals as Topic / Q000592:standards*; D015871:Scientific Misconduct; D014956:Writing
keywords: acknowledgement; authorship; editorial practice; research integrity