Conflict of interest policies for editors and peer reviewers in medical journals: cross-sectional study

Before a scientific study is published as a research paper in a medical journal, it is evaluated by the journal editors and other researchers, known as peer reviewers. This process is used to assess and ensure the quality and trustworthiness of the research and to assist editors in deciding whether to publish the paper. Editors and peer reviewers, however, are not necessarily neutral and may have personal interests that can influence their opinions. For example, they may have personal relationships with the study authors or have financial relationships with a company whose product is investigated in the study, which could result in conflicts of interest. Although most journals have policies addressing study authors' conflicts of interest, little is known about the practices and policies of medical journals concerning editors' and peer reviewers' conflicts of interest. In our study, we randomly selected 250 medical journals and examined their public conflict of interest policies for editors and peer reviewers, as well as whether these policies aligned with their publishers' policies. In addition, we assessed whether the interests of editors and peer reviewers were publicly disclosed. We estimated the proportion of journals with available policies, assessed which journal characteristics were associated with having a policy, and analyzed the content of policies. Of the 250 medical journals, we found that 177 (71%) journals had a conflict of interest policy for editors and 174 (70%) for peer reviewers, but their interests were very rarely publicly disclosed. The policies often contained limited information and were often only described in detail in the publishers' policies, and sometimes information in the journal's and the publisher's policies was in disagreement. Finally, policies rarely describe how journal staff assess interests, how these assessments may influence the journal's editorial process, and how journals enforce the consequences of policy violations. There is substantial potential for medical journals to improve their conflict of interest policies for editors and peer reviewers, as well as the transparency of their interests in medical journals.