Variation in prolactin is related to variation in sexual behavior and contact affiliation.

PLoS One · 2015 · PMC4370565 · PMID 25799436

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showed a trendno p-value reported

Contact affiliation showed a trend toward a significant correlation with female prolactin levels in each study.

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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.