What evidence is being used?
The Department of Health has, until May 2007, issued guidelines that are similar to those of NICE; the news story has arisen out of the fact that the DoH has changed the guidelines, while NICE has not. As O’Brian notes in the BMJ O'Brian2007, the new DoH advice does not rest on any new evidence, but merely on the reinterpretation of the risk associated with the already known evidence. Therefore this particular news story centres not so much on conflicting evidence supporting two different points of view, but on two different interpretations of the same evidence.