Let me try to explain better... my concern is about the subgoup that starts with fewer signs and symptoms and gets more later. I would not have quite met CCC during the first year or so of my disease. I remember no sleep disturbance at first. Don't remember for sure, but I may also have been missing another category or two. What could they have diagnosed me with under the "evaluate the entire course of my (so far relatively short) disease" guideline when I didn't yet meet CCC?
Then again, perhaps I had a different postviral disease first, and got ME later? But that doesn't meet Occam's Razor (it makes the explanation more complicated). However, it might mean that at that early point, maybe I would not have been a good pick for a research study, so using CCC for research might be best. I'm just not sure CCC for clinical diagnosis picks up everyone who will eventually meet CCC. Again, though, they have this same problem with Lupus, MS... diseases like this develop over time and it might take 2 years to get diagnosed properly.