Are current chronic fatigue syndrome criteria diagnosing different disease phenotypes?

PLoS One · 2017 · PMC5650174 · PMID 29053742

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a statistical trendno p-value reported

Across DSQ subgroups there are statistically significant differences in FIS and COMPASS 31 scores, and there was a statistical trend for a monotonic increase of self-reported cognitive impairment with increased DSQ category.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.