Turning a blind eye: Authors have blinkered view of blinding

doi:10.1136/bmj.328.7448.1135-b

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Stephen J Senn, professor of statistics (stephen@stats.gla.ac.uk)

University of Glasgow, Glasgow G12 8QQ

EDITOR—Fergusson et al consider a trial to be double blind when the patient, investigators, andoutcome assessors are unaware of the patient's assigned treatment throughout the conduct of the trial.1 They are quite wrong to do so.