Human semen quality in the new millennium: a prospective cross-sectional population-based study of 4867 men.

BMJ Open · 2012 · PMC3391374 · PMID 22761286

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an increasing trendno p-value reported

Conclusions This large prospective study of semen quality among young men of the general population showed an increasing trend in sperm concentration and total sperm count.

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a decreasing trendno p-value reported

The resulting papers reported heterogeneous findings (reviewed in Jouannet et al 6 and Merzenich et al 7 ), with some confirming a decreasing trend in semen quality, and others not.

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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.