Data Availability & Reproducibility

Every research manuscript must include a data-availability statement describing where supporting data and, where relevant, code, protocols and analysis materials can be accessed.

What to report

Identify a repository and persistent identifier where materials are available. Explain access conditions, relevant licences and any embargo. For non-public data, state the reason, who may request access and the process for considering requests. “Available on request” should only be used where the authors can lawfully and realistically fulfil an appropriate request.

Protect participants

Open sharing must not override consent, confidentiality, contractual obligations or legitimate restrictions. Remove direct and indirect identifiers where appropriate. Controlled access or a clear explanation of restrictions is acceptable when unrestricted sharing is not ethical or lawful. Do not post identifiable patient records or signed consent forms.

Reproducible reporting

Describe study design, sampling, exclusions, missing data, outcome definitions, statistical methods and software sufficiently for evaluation. Report effect estimates with uncertainty, distinguish planned from exploratory analyses and disclose protocol changes. Provide search strategies and study-selection methods for evidence syntheses. Identify any simulated, synthetic or reused data explicitly.

Editorial verification

Editors may request underlying materials to resolve questions about validity. Authors should preserve original records in accordance with their institution’s requirements. Inability to supply necessary evidence may affect a decision or trigger an integrity review. For reviews without new participant data, state how extracted data and analysis files can be accessed.

Policy enquiries: editor@jmhmr.com · Updated 1 October 2026.