Demographic data.

Background
Despite having a crucial role in scholarly publishing, peer reviewers do not typically require any training. The purpose of this study was to conduct an international survey on the current perceptions and motivations of researchers regarding peer review training.
Methods
A cross-sectional online survey was conducted of biomedical researchers. A total of 2000 corresponding authors from 100 randomly selected medical journals were invited via email. Quantitative items were reported using frequencies and percentages or means and SE, as appropriate. A thematic content analysis was conducted for qualitative items in which two researchers independently assigned codes to the responses for each written-text question, and subsequently grouped the codes into themes. A descriptive definition of each category was then created and unique themes–as well as the number and frequency of codes within each theme–were reported.
Results
A total of 186 participants completed the survey of which 14 were excluded. The majority of participants indicated they were men (n = 97 of 170, 57.1%), independent researchers (n = 108 of 172, 62.8%), and primarily affiliated with an academic organization (n = 103 of 170, 62.8%). A total of 144 of 171 participants (84.2%) indicated they had never received formal training in peer review. Most participants (n = 128, 75.7%) agreed–of which 41 (32.0%) agreed strongly–that peer reviewers should receive formal training in peer review prior to acting as a peer reviewer. The most preferred training formats were online courses, online lectures, and online modules. Most respondents (n = 111 of 147, 75.5%) stated that difficulty finding and/or accessing training was a barrier to completing training in peer review.
Conclusion
Despite being desired, most biomedical researchers have not received formal training in peer review and indicated that training was difficult to access or not available.