Sperm counts significantly declining in men from North America, Europe

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[/style][style=color:#333333]BACKGROUND

Reported declines in sperm counts remain controversial today and recent trends are unknown. A definitive meta-analysis is critical given the predictive value of sperm count for fertility, morbidity and mortality.





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OBJECTIVE AND RATIONALE

To provide a systematic review and meta-regression analysis of recent trends in sperm counts as measured by sperm concentration (SC) and total sperm count (TSC), and their modification by fertility and geographic group.[/style][style=color:#333333]



“In this comprehensive meta-analysis, sperm counts whether measured by SC or TSC declined significantly among men from North America, Europe and Australia during 1973–2011, with a 50–60% decline among men unselected by fertility, with no evidence of a ‘leveling off' in recent years,” the authors concluded.

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[style=font-weight:bold;]Reference[/style]

1. 
   
   Levine H, Jørgensen N, Martino-Andrade A, et al. Temporal trends in sperm count: a systematic review and meta-regression analysis. [style=font-style:italic;]Hum Reprod Update. 25 July 2017. https://doi.org/10.1093/humupd/dmx022[/style]