Turning a blind eye:Testing the success of blinding and the CONSORT statement

doi:10.1136/bmj.328.7448.1135-a

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Douglas G Altman, director (doug.altman@cancer.org.uk),
Kenneth F Schulz, vice president,
David Moher, director

Cancer Research UK Medical Statistics Group, Centre for Statistics in Medicine, Oxford OX3 7LF
Quantitative Sciences, Family Health International, Research Triangle Park, NC, USA
Chalmers Research Group, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada

EDITOR—Reports of randomised trials should state clearly whether blinding was attempted, and if so who was blinded and how this was done.1 Fergusson et al note that blinding may be ineffective in some trials, making them less sound methodologically than they seem to be.2

But trial participants asked to …