Many reports of RCTs give insufficient data for Cochrane reviewers

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 …