The importance of maintaining credibility A key issue here is the notion of false positives based upon what? The Canadian Criteria, Fukuda, etc.? I think the Jason article gets it right. It does not try to assume that we have ONE set of diagnostic criteria at this point in time. All Jason says is that when using the CDC criteria, you get 38% of those diagnosed with CFS as actually having Major Depression, not CFS. The other point to keep in mind is that the CDC criteria yields an estimated prevalence of nearly 4 times that of the population estimates using other Criteria (I need to verify and I also need a reference but if I recall correctly, this was measured against the Canadian Criteria as well). We need to be careful when citing numbers and stick using figures we can back up. Doing so can only help with our credibility. Now I really am checking out for a few days (feel free to remind me to stop being an "idiot").