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Open Access Highly Accessed Open Badges Letter

Information on blinding in registered records of clinical trials

Roderik F Viergever12* and Davina Ghersi3

Author Affiliations

1 Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK

2 Department of Primary and Community Care, Radboud University Nijmegen Medical Center, PO Box 9101, 6500HB, Nijmegen, The Netherlands

3 NHMRC Clinical Trials Centre, Sydney Medical School, University of Sydney, Sydney, Australia

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Trials 2012, 13:210  doi:10.1186/1745-6215-13-210

Published: 15 November 2012


Information on blinding is part of the data that should be provided upon registration of a trial at a clinical trials registry. Reporting of blinding is often absent or of low quality in published articles of clinical trials. This study researched the presence and quality of information on blinding in registered records of clinical trials and highlights the important role of data-recording formats at clinical trial registries in ensuring high-quality registration.

Clinical trials; Clinical trials registration; Blinding; Masking; Research policy