The sperm count of men in Western countries has been declining precipitously with no signs of “leveling off,” according to new research, bolstering a school of thought that male health in the modern world is at risk, possibly threatening fertility.
By examining thousands of studies and conducting a meta-analysis of 185 — the most comprehensive effort to date — an international team of researchers ultimately looked at semen samples from 42,935 men from 50 countries from 1973 to 2011.
They found that sperm concentration — the number of sperm per milliliter of semen — had declined each year, amounting to a 52.4 percent total decline, in men from North America, Europe, Australia and New Zealand.
Total sperm count among the same group also tumbled each year for a total decline of 59.3 percent over the nearly 40-year period.
Decreasing sperm count was first reported a quarter century ago, but the new analysis shows that “this decline is strong and continuing,” said Dr. Shanna H. Swan, one of the study’s authors and a professor at the Icahn School of Medicine at Mount Sinai in New York.
This article continues at [New York Times] Sperm Count in Western Men Has Dropped Over 50 Percent Since 1973, Paper Finds