Allocation concealment and blinding: when ignorance is bliss

Harri Hemilä
Med J Aust 2005; 183 (3): . || doi: 10.5694/j.1326-5377.2005.tb06975.x
Published online: 1 August 2005

To the Editor: In their article on controlled trials, Forder et al1 described the trial by Karlowski et al on vitamin C and the common cold2 as an example of how patients’ or investigators’ preconceptions about the value of the treatment may affect a trial’s results. However, their presentation of this trial is misleading in two respects.

  • Harri Hemilä

  • Department of Public Health, University of Helsinki, POB 41, Helsinki, FIN-00014, Finland.



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