Di Blasi, Z, Kaptchuk, T.J., Weinman, J. and Kleijnen, J. (2002) Informing participants of allocation to placebo at trial closure: postal survey. BMJ. pp. 1329-1331. ISSN 0959-8138Full text available as:
OBJECTIVES: To assess whether and how investigators of placebo controlled randomised trials inform participants of their treatment allocation at trial closure and to assess barriers to feedback. DESIGN: Postal survey with a semistructured questionnaire. PARTICIPANTS: All investigators who published a placebo controlled randomised trial in 2000 in five leading medical journals, and a random sample of 120 trials listed in the national research register database. MAIN OUTCOME MEASURES: Number of investigators who informed participants of their treatment allocation at trial closure, methods for delivering the information, and barriers to unmasking treatment. RESULTS: 45% of investigators informed either all or most participants of their treatment allocation, and 55% did not inform any participant or only informed those who asked. The main reasons for not informing participants were that the investigators never considered this option (40%) or to avoid biasing results at study follow up (24%). CONCLUSION: Further research is required to examine sensitive ways to communicate treatment information to trial participants.
|Copyright, Publisher and Additional Information:||© 2002 BMJ Publishing|
|Academic Units:||The University of York > Centre for Health Economics (York)|
|Depositing User:||Repository Officer|
|Date Deposited:||13 Oct 2004|
|Last Modified:||17 Oct 2013 14:31|