Progesterone therapy, endothelial function and cardiovascular risk factors: a 3-month randomized, placebo-controlled trial in healthy early postmenopausal women.

PLoS One · 2014 · PMC3897380 · PMID 24465425

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did not reach statistical significanceno p-value reported

The 15% increase in flow-mediated dilatation in this short-term trial of oral progesterone did not reach statistical significance, probably because of a lack of power.

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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.