Article Text

Download PDFPDF
The Meaning of Author Order in Medical Research
  1. Mark Otto Baerlocher,
  2. Marshall Newton,
  3. Tina Gautam,
  4. George Tomlinson,
  5. Allan S. Detsky
  1. From the University of Toronto Radiology Residency Training Program (M.O.B.); Departments of Health Policy Management and Evaluation and Medicine (M.N., T.G., A.S.D.) and Medicine and Public Health Services (G.T.), University of Toronto; Department of Medicine (M.N., T.G., A.S.D., G.T.), Mount Sinai Hospital; and Department of Medicine (M.N., T.G., A.S.D., G.T.), University Health Network, Toronto, ON.
  1. Address correspondence to: Dr. Allan S. Detsky, Mount Sinai Hospital, 427-600 University Avenue, Toronto, ON M5G 1X5; e-mail: allan.detsky{at}


Background Manuscript authorship and author placement have important implications for accountability and allocation of credit. The objective of this study was to assess the relationship between an author's place in the author list and the type of contribution reported by that author. This pattern was then used to develop a method by which author responsibility and accountability can be clarified.

Methods The published contributions of each author of original research articles with a minimum of four authors published in the Journal of the American MedicalAssociation, the British Medical Journal, TheLancet, and the Canadian Medical Association Journal in a 3-year period after author contribution forms were required were coded into 1 of eleven contribution categories. The contributions were grouped according to first, second, middle, and last author and compared by position.

Results For most categories of contribution, the levels of participation were highest for first authors, followed by last and then second authors. Middle authors had lower levels particularly in conception, drafts of the manuscript, supervision, and being a guarantor.

Conclusions Current patterns of author order and contribution suggest a consistent theme. Based on the results, a proposal is put forth by which author accountability is clarified. In this proposal, authors are classified as either “primary,” “contributing,” or “senior or supervisory,” each with specified contributions. More than one author may be classified into each author category.

Key words
  • authorship
  • biomedical research
  • publication
View Full Text

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.