Depression and risk of transformation of episodic to chronic migraine.

J Headache Pain · 2012 · PMC3484253 · PMID 23007859

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highly significantno p-value reported

In the fully adjusted model (Model 2), the effect of depression on CM onset, though highly significant, was substantially attenuated.

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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.