International Registered Reports Identifiers (IRRIDs): 7 Years of Experiences

Gunther Eysenbach¹ <h4>Objective</h4> Registered Reports (RRs) refer to the publication of a study that is published in 2 stages: a protocol (RR stage 1 or RR1) and a results paper (RR2). Some journals have adopted the RR system and guarantee acceptance of subsequent results articles published in the same journal after the protocol is peer reviewed. However, in a distributed open science ecosystem, protocols may already be peer reviewed and published elsewhere, but no standardized system exists to link protocols to subsequent results articles and vice versa. We implemented RRs across the publisher portfolio, with 1 dedicated journal to peer review and publish protocols, and the publisher guaranteeing acceptance of RR2s in 1 of its other journals independently based on whether the results were negative or positive. We propose a machine- and human-readable mechanism to link RR2s with RR1s to assist in peer review and to enhance transparency, accountability, and reproducibility. <h4>Design</h4> In 2018, we proposed and implemented a cross-journal, DOI-based, persistent identifier called an International Registered Report Identifier (IRRID) published in article abstracts. An RR2 references an RR1 using an identifier that is based on the DOI of the protocol. For example, RR2-10.2196/24264 indicates that the publication is a results article for a protocol that was previously published under the DOI 10.2196/24264.¹ Protocols that are peer reviewed contain the IRRIDs in the format [DE|P]RR1-[DOI], where [DOI] is the DOI of the protocol itself, and DE or P qualifiers indicate whether the protocol was written before [P] or after [DE] data collection. On submission of a protocol, authors were asked if the protocol was submitted before or after data were collected. Authors were incentivized to register their protocol by being offered a 20% discount on the Article Processing Charge on subsequent results articles. <h4>Results</h4> A total of 3995 articles were published with IRRIDs between 2018 and February 13, 2025, of which 3240 (81%) were protocols (RR1). Among the protocols, 2151 (66%) were published when data already existed (DERR1), and 917 (28%) were published before data were collected (PRR1). A total of 732 results articles had an RR2 identifier indicating previous protocol publication, although these protocols were not always peer reviewed (eg, OSF or <i>BMJ Open</i>). A third-party audit found that outcome switching and undeclared deviations from the protocol still remain a problem.² <h4>Conclusions</h4> We propose that other journals adopt IRRIDs to help identify protocol and results article pairs that together form RRs across journals (<a href="https://irridregistry.org/"><span class="Hyperlink CharOverride-6">https://irridregistry.org/</span></a>). <h4>References</h4> 1. What is an International Registered Report Identifier (IRRID)? JMIR Publications Knowledge Base and Help Center. Accessed February 13, 2025. <a href="https://support.jmir.org/hc/en-us/articles/360003797672-What-is-an-International-Registered-Report-Identifier-IRRID"><span class="Hyperlink CharOverride-6">https://support.jmir.org/hc/en-us/articles/360003797672-What-is-an-International-Registered-Report-Identifier-IRRID</span></a> 2. Anthony N, Tisseaux A, Naudet F. Published registered reports are rare, limited to one journal group, and inadequate for randomized controlled trials in the clinical field. <i>J Clin Epidemiol</i>. 2023;160:61-70. doi:10.1016/j.jclinepi.2023.05.016 ¹JMIR Publications, Toronto ON, Canada, geysenba@gmail.com. <h4>Conflict of Interest Disclosure </h4> Gunther Eysenbach has an equity stake in and receives a salary from JMIR Publications.

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