Recent meta-analyses support a decline in sperm quality over recent decades across Western, African, and Asian countries.

“most recently just in the last year or so there was a meta analysis of you know tens of thousands of men where they looked at again a host of these studies over the last number of decades all around the globe so prior studies to really just focused on the Western Hemisphere Western countries CU there was more data from that but more recently we've gotten a lot of data from Africa from Asian countries as well and those also support this decline”