Epidemiologic methods for investigating male fecundity.

Asian J Androl · 2014 · PMC3901876 · PMID 24369129

Europe PMC DOI

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an increasing trendno p-value reported

Many factors unrelated to male subfecundity could have played roles in the childlessness of these women, 1 but an increasing trend would be a warning signal.

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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.