Declining sperm countSemen quality has declined among men born in France since 1950 EDrroR,-Several recent papers have reported a possible decrease in sperm counts.`15Three of them were based on data collected in single laboratories, from a relatively low number of fertile men (between 302 and 1351).`-3Their conclu- sions were in favour of a decline related to the year of birth1 or to the year of the measurement3 or of no change.2The two other papers were reviews of the same published papers, the first concluding that sperm counts had decreased and
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Mouzon et al. (1996) studied this question.
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