The question of declining sperm density revisited: an analysis of 101 studies published... - 0 views
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Nathan Goodyear on 27 Jul 13Re-analysis of Carlsen's work on sperm count finds consistent decline in sperm count. Swan and authors found a 1.5% decline in US men from 1934-1996 and 3% annual decline in European/Australian men over same time frame. This was a meta-analysis of 101 studies from 1934-1996. Yes, there is geographical variation, but the overall trend is one of decline.