Paranasal sinus air suction for immediate pain relief of acute migraine - a randomized, double blind pilot study.

BMC Neurol · 2019 · PMC6813051 · PMID 31646974

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a slight trendno p-value reported

The Spearman correlation coefficient was − 0.2076 ( P = 0.04) and thus it indicates that there could be a slight trend on low airflow leading to high tenderness.

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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.