An assessment of the informative value of data sharing statements in clinical trial registries.

"the data repository (e g csdr vivli or yoda) should have its own access policies and procedures and not be just a repository for publicly available documents (e g zenodo)."

"Declarations Ethics approval and consent to participateNot applicable to this study. Consent for publicationNot applicable. Only public information from clinical trial registries was used as input into the assessment exercise. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests. "

"Funding The study was performed in the context of the BY-COVID project. BY-COVID is funded by the European Union’s Horizon Europe research and innovation programme under grant agreement number 101046203. In BY-COVID, secondary use of individual participant COVID-19 vaccine trial data and biosamples is planned (e.g., to test existing vaccines against emerging variants). The current study was performed, to support discovery of completed COVID-19 trials from clinical trial registries, willing to share IPD for secondary use in BY-COVID. The funding bodies played no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript."

"Trial registration The protocol for the study was pre-registered on ZENODO (https://zenodo.org/record/7064624#.Y4DIAHbMJD8)."