The CONSORT group, made up in particular of methodologists and journal editors, has created a tool in the form of a list. This tool, known as the "CONSORT statement", sets out all items that must be reported when preparing for publication in medical journals with regard to methods, results and discussion of randomised controlled trials (RCT). The aim of this group and of the CONSORT statement is to help authors prepare a standard presentation of the methodology and results of their studies. The desired effect is to ensure greater transparency and optimal rigor in such presentations, and thus in study design. This will make it easier for readers to verify such studies and to assess any potential sources of study bias. (C) 2013 Elsevier Masson SAS. All rights reserved.