CNN —Male sperm count has fallen by more than 50% globally in the last 50 years, leaving researchers scrambling to understand why. The men also had a 30% higher risk for a low sperm concentration, a less important measure of sperm count in a milliliter of semen. On the positive side, researchers found that as phone technology improved over the 13 years of the study, the impact on sperm count began to ease. As cell phone usage climbed, sperm count dropped, with the lowest levels among men using their phone 20 or more times a day. The greatest association between low sperm count and concentration and phone use were between 2005 and 2007.

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Persons: ”, Allan Pacey, Alison Campbell, Campbell, Alexander Pastuszak, Pastuszak, Luis Alvarez, ” Pacey, “, it’s, ” Pastuszak Organizations: CNN, University of Manchester, Mobile, “, The University of Utah School of Medicine, California Department of Public Health Locations: United Kingdom, Salt Lake City