So I read about the sperm count decline in men in rich countries. I wonder if this is accompanied by other changes for example in testosterone levels or in other hormones linked with the reproductive system ? Also other measures such as semen volume ? Example report on this issue https://www.sciencedaily.com/releases/2017/07/170726110954.htm

Also, the report shows a steady decline - will this continue and what would be the bottoming out of this trend ?

  • $\begingroup$ With an aging population, thanks to better medical science lower average testosterone and sperm is to be expected. If the study is not accounting for this it is pointless. $\endgroup$
    – John
    Jul 30, 2018 at 14:53
  • $\begingroup$ Obesity is an important confounder here as well. $\endgroup$
    – De Novo
    Jul 30, 2018 at 18:08
  • $\begingroup$ Adding another question. $\endgroup$ Jul 30, 2018 at 18:19
  • $\begingroup$ Levine, H., Jørgensen, N., Martino-Andrade, A., Mendiola, J., Weksler-Derri, D., Mindlis, I., ... & Swan, S. H. (2017). Temporal trends in sperm count: a systematic review and meta-regression analysis. Human Reproduction Update, 23(6), 646-659. is the actual citation for the study. $\endgroup$
    – Bryan Krause
    Jul 30, 2018 at 18:23
  • $\begingroup$ I think I'm half way to finding an answer sciencedaily.com/releases/2018/03/180318144836.htm $\endgroup$ Jul 31, 2018 at 8:38


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