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Identification of trials in clinicaltrials.gov and data extraction from registries

KS Kinga Amália Sándor-Bajusz
AK Andrea Kraut
OB Odgerel Baasan
GM Gergely Márovics
KB Károly Berényi
SL Szimonetta Lohner
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We extracted the following pre-defined study characteristics from EU CTR: full title of the trial, authorization date, trial start and completion, information on participating countries, sponsor, funder, trial scope, trial design, blinding, sample size, study phase, therapeutic area and presence of a data monitoring committee (DMC).

We tried to identify included trials in the register clinicaltrials.gov by searching the EU CTR identifier or by the use of specific PICO terms.

We determined whether study results were available in the study registries EU Clinical Trial Register and ClinicalTrials.gov. In this current paper, we aim to distinguish results available in the registries (“results in registries”) from results published as full scientific publications (“publication”).

Copyright and License information: The Author(s) ©2022
Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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