Gastroduodenal Ulcers and ABO Blood Group: the Japan Nurses' Health Study (JNHS).

J Epidemiol · 2018 · PMC5742377 · PMID 29093357

Europe PMC DOI

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did not reach statistical significanceno p-value reported

However, the association between blood type O and increased risk of gastric cancer 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.