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Human semen quality in the new millennium: a prospective cross-sectional population-based study of 4867 men
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  • Published on:
    Semen quality in young men twenty years after Carlsen et al.

    Dear Editor, Twenty years ago Carlsen et al. analyzed data from 14,947 men included in 61 papers published between 1938 and 1991 and concluded that sperm concentration had declined significantly over the prior 50 years (1). Numerous criticisms and analyses followed this landmark publication. Among these, our detailed reanalysis found that this conclusion was, indeed, supported by the underlying studies (2,3). Many other i...

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    Conflict of Interest:
    None declared.