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Many reports of RCTs give insufficient data for Cochrane reviewers

BMJ 1999; 319 doi: (Published 24 July 1999) Cite this as: BMJ 1999;319:257
  1. E Haydn Walters, Professor and director (,
  2. J A E Walters, Lecturer (
  1. Department of Respiratory Medicine, The Alfred and Monash Medical School, Prahran, Melbourne, Victoria 3181, Australia
  2. Department of Respiratory Medicine, Monash Medical School, Prahran, Melbourne, Victoria 3181

    EDITOR—We endorse the call in Editor's choice in the issue of 31 October for improvement in the performance of clinical trials. As part of the Cochrane Airways Group we are carrying out a systematic review of trials on the use of β agonists in asthma. In many of our selected publications we have found it difficult to tell whether allocation of treatment was adequately concealed.

    The reviews undertaken for the Cochrane Collaboration …

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