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BMJ 1996; 312 doi: (Published 26 February 1996) Cite this as: BMJ 1996;312:0

From Malthus to Scott

To a Malthusian recent reports of falls in sperm counts probably seem like a global response to overpopulation. But speculation about their cause - and indeed whether counts really are falling - continues in this week's issue. Irvine and colleagues present evidence from Scottish men born between 1951 and 1973, showing that semen quality (concentration, count, and motility) fell over the period (p 467). They refer to the suggestion that xenoestrogens may be implicated. In contrast, however, Bujan and colleagues have found no …

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