Evidence for decreasing quality of sperm

BMJ 1995; 311 doi: https://doi.org/10.1136/bmj.311.7004.569c (Published 26 August 1995) Cite this as: BMJ 1995;311:569
  1. Alexander Lerchl
  1. Scientifiic worker Institute of Reproductive Medicine of the University, D-48149 Munster, Germany

    Presentation of data on sperm concentration was flawed

    EDITOR,--Few studies have attracted as much attention as that by Carlsen et al on the decline in human sperm concentrations over the past 50 years.1 Few studies, however, have caused so much controversy as well.2 3 4 Carlsen et al analysed 61 publications from 1938 to 1990 in which sperm samples from presumably normal men were investigated. In a table the authors gave, for each publication, the number …

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