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Data sharing statements for clinical trials

BMJ 2017; 357 doi: (Published 05 June 2017) Cite this as: BMJ 2017;357:j2372

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  1. Darren B Taichman, executive deputy editor, Annals of Internal Medicine,
  2. Peush Sahni, past president, World Association of Medical Editors,
  3. Anja Pinborg, scientific editor in chief,, Ugeskrift for Laeger,
  4. Larry Peiperl, chief editor, PLOS Medicine,
  5. Christine Laine, editor in chief, Annals of Internal Medicine,
  6. Astrid James, deputy editor, Lancet,
  7. Sung-Tae Hong, editor in chief, Journal of Korean Medical Science,
  8. Abraham Haileamlak, editor in chief , Ethiopian Journal of Health Sciences,,
  9. Laragh Gollogly, editor, Bulletin of the World Health Organization,
  10. Fiona Godlee, editor in chief, The BMJ,
  11. Frank A Frizelle, editor in chief, New Zealand Medical Journal,
  12. Fernando Florenzano, editor, Revista Médica de Chile,
  13. Jeffrey M Drazen, editor in chief, New England Journal of Medicine,
  14. Howard Bauchner, editor in chief, JAMA and the JAMA Network,
  15. Christopher Baethge, chief scientific editor, Deutsches Ärzteblatt and Deutsches Ärzteblatt International,
  16. Joyce Backus, associate director for library operations, National Library of Medicine

A requirement of the International Committee of Medical Journal Editors

The International Committee of Medical Journal Editors (ICMJE) believes there is an ethical obligation to responsibly share data generated by interventional clinical trials because trial participants have put themselves at risk. In January 2016 we published a proposal aimed at helping to create an environment in which the sharing of deidentified individual participant data becomes the norm. In response to our request for feedback we received many comments from individuals and groups.1 Some applauded the proposals while others expressed disappointment that they did not more quickly create a commitment to data sharing. Many raised valid concerns regarding the feasibility of the proposed requirements, the necessary resources, the real or perceived risks to trial participants, and the need to protect the interests of patients and researchers.

It is encouraging that data sharing is already occurring in some settings. Over the past year, however, we have learnt that the challenges are substantial and the requisite mechanisms are not in place to mandate universal data sharing at this time. Although many issues must be addressed for data sharing to become the norm, we remain committed to this goal.

Therefore, ICMJE will require the following as conditions of consideration for publication of a clinical trial report in our member journals:

  1. As of 1 July 2018 manuscripts submitted to ICMJE journals that report the results of clinical trials must contain a data sharing statement as described below.

  2. Clinical trials that begin enrolling participants on or after 1 January 2019 must include a data sharing plan in the trial’s registration. The ICMJE’s policy regarding trial registration is explained at If the data sharing plan changes after registration this should be reflected in the statement submitted and published with the manuscript, and updated in the registry record.

Data sharing statements must indicate the following: whether individual deidentified participant data (including data dictionaries) will be shared; what data in particular will be shared; whether additional, related documents will be available (study protocol, statistical analysis plan, etc); when the data will become available and for how long; by what access criteria data will be shared (including with whom, for what types of analyses, and by what mechanism). Illustrative examples of data sharing statements that would meet these requirements are in the table.

These initial requirements do not yet mandate data sharing, but investigators should be aware that editors may take into consideration data sharing statements when making editorial decisions. These minimum requirements are intended to move the research enterprise closer to fulfilling our ethical obligation to participants. Some ICMJE member journals already maintain, or may choose to adopt, more stringent requirements for data sharing.

Sharing clinical trial data is one step in the process articulated by the World Health Organization (WHO) and other professional organisations as best practice for clinical trials: universal prospective registration; public disclosure of results from all clinical trials (including through journal publication); and data sharing. Although universal compliance with the requirement to prospectively register clinical trials has not yet been achieved and requires continued emphasis, we must work towards fulfilling the other steps of best practice as well— including data sharing.

As we move forward into this new norm where data are shared, greater understanding and collaboration among funders, ethics committees, journals, trialists, data analysts, participants, and others will be required. We are currently working with members of the research community to facilitate practical solutions to enable data sharing. The US Office for Human Research Protections has indicated that provided the appropriate conditions are met by those receiving them, the sharing of deidentified individual participant data from clinical trials does not require separate consent from trial participants.2 Specific elements to enable data sharing statements that meet these requirements have been adopted at ( WHO also supports the addition of such elements at the primary registries of the International Clinical Trials Registry Platform. Unresolved issues remain, including appropriate scholarly credit to those who share data, and the resources needed for data access, the transparent processing of data requests, and data archiving. We welcome creative solutions to these problems at

We envision a global research community in which sharing deidentified data becomes the norm. Working towards this vision will help maximise the knowledge gained from the efforts and sacrifices of clinical trial participants.

Examples of data sharing statements that fulfil ICMJE requirements*

View this table:


  • This article is being published simultaneously in Annals of Internal Medicine, The BMJ, Bulletin of the World Health Organization, Deutsches Ärzteblatt, Ethiopian Journal of Health Sciences, JAMA, Journal of Korean Medical Science, New England Journal of Medicine, New Zealand Medical Journal, PLOS Medicine, Lancet, Revista Médica de Chile, and Ugeskrift for Laeger. PS’s affiliation with the World Association of Medical Editors does not imply endorsement by WAME member journals that are not part of the ICMJE.

  • Competing interests: We have read and understood BMJ policy on declaration of interests and declare that LP has received travel reimbursement from the WHO and the Association of Health Care Journalists for consulting and speaking activities relating to data sharing.

  • Provenance and peer review: Commissioned; not externally peer reviewed.

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