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Turning a blind eye:Authors' reply

BMJ 2004; 328 doi: (Published 06 May 2004) Cite this as: BMJ 2004;328:1136
  1. Dean Fergusson, scientist,
  2. Kathleen Cranley Glass, professor,
  3. Duff Waring, research associate,
  4. Stan Shapiro, professor
  1. Ottawa Health Research Institute, Clinical Epidemiology Program, 501 Smyth Road, Box 201, Ottawa, ON, Canada K1H 8L6
  2. Departments of Human Genetics and Pediatrics and Biomedical Ethics Unit, McGill University, Montreal, QC, Canada
  3. Research Ethics and Regulation Group, Faculty of Law, University of Toronto, Toronto, ON, Canada
  4. Department of Epidemiology and Biostatistics, McGill University

    EDITOR—Altman et al and Senn correctly note that a strong relation is likely between patients' improvement, real or perceived, and a subsequent guess by patients, investigators, or outcome assessors that active treatment had been assigned. Admittedly, assessing blinding by simply examining the proportion of correct “guesses” is …

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