Average sperm count decline

Int J Androl. Interestingly, the fertility rate has gone down in the last few decades and a number of populations have reached a stage where growth revival is difficult to achieve. Methods Publications providing semen analysis details for fertile and infertile men from the Indian sub-continent were collected by a thorough literature search. Apart from the direct exposure, prenatal and postnatal exposures have also been suggested to affect sperm parameters. Swan said. Sharpe wrote in the Journal of Endocrinology. We need to kind of up our technology game.

Both the researchers and the media have a number of theories as to why this might be the case, ranging from exposure to chemicals and pesticides to The Independent's suggestion that modern life was to blame. John Rentoul. Please be respectful when making a comment and adhere to our Community Guidelines. The authors didn't report any kind of formal quality assessment of the studies they included in their analysis. Sign In See Subscription Options. Money transfers. When the researchers combined the basic results of all the studies without taking into account other influencing factors, they found that from there was on average a 0.

Following a fixed population over time in a cohort study might have had different findings. As guys are getting bigger, one thing is getting smaller: their sperm counts. Tech news. The study looked at sperm count and concentration, not the quality of the sperm itself, because there was limited reporting of this information in older studies.