Irisin Serum Levels in Metabolic Syndrome Patients Treated with Three Different Diets: A Post-Hoc Analysis from a Randomized Controlled Clinical Trial.

Nutrients · 2018 · PMC6073260 · PMID 29958455

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a slight trendno p-value reported

did not reach statistical significanceno p-value reported

There was also a slight trend to increase of irisin with age but did not reach statistical significance.

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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.