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Firestormm, yes, I think this paper raises more questions than it answers, and I'm not as enthusiastic about it as Erica either, but I do find it very interesting.
I think some answers might lie within Jason's previous papers related to the DePaul Symptom Questionnaire (DSQ), but I've not read up on the DSQ. I'm not sure if I've had access to the relevant papers, despite looking for them occasionally.
I think that question 2 ("
Next day soreness or fatigue after non-strenuous, everyday activities") could perhaps be considered to be related to a
delayed post-exertional reaction, but I agree with you that the wording isn't specific enough. Perhaps it isn't helpful to specify a period of delay in a
clinical criteria because the period of delay is different for everyone, and it would confused both patients and clinicians? And I think it's very hard for new patients, for example, to be aware of any delay because they don't yet associate today's flare-up with yesterday's exertion.
I'm not sure if this paper is trying to be reflective of the CCC and ICC, exclusively. They seem to be including Fukuda patients. I still don't understand how Jason decided who had ME/CFS for the purposes of this study or for the DSQ in general.