This is described as a randomised trial, but the only randomisation is between two super-clusters each of 6 review groups. This cannot make the two groups comparable, only the judgement of the researcher who grouped them could do that. Hence it is not a randomised trial.
Read the Rapid Responses to this paper (including mine) and the authors' reply, at the end of the paper.
Back to Randomisation Methods.
To Trials course index.
To Martin Bland's M.Sc. index.
To Martin Bland's home page.
This page maintained by Martin Bland.
Last updated: 16 July, 2009.
Back to top.