The sperm-count "crisis" doesn't add up

Now a group of interdisciplinary researchers from Harvard and the Massachusetts Institute of Technology contend that fears of an impending Spermageddon have been vastly overstated. In a study published in May in the journal Human Fertility, they re-evaluated the 2017 review and found that it relied on flawed assumptions and failed to consider alternate explanations for the apparent decline of sperm. In an interview, Sarah Richardson, a Harvard scholar on gender and science and the senior author on the new study, called the conclusion of the 2017 review “an astonishing and terrifying claim that, were it to be true, would justify the apocalyptic tenor of some of the writing.” Fortunately, she and her co-authors argue, there is little evidence that this is the case. The 2017 authors were “methodologically rigorous” when it came to screening sperm-count studies for quality and consistency, Dr. Richardson and her colleagues write. However, even the data that passed muster was geographically sparse and uneven and often lacked basic criteria like the age of the men. Moreover, its authors took for granted that a single metric — sperm count — was an accurate predictor of male fertility and overall health.