Letters

Recent decline may be relatively late stage of long term process

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7048.44a (Published 06 July 1996) Cite this as: BMJ 1996;313:44
  1. Michael Joffe
  1. Senior lecturer Imperial College School of Medicine at St Mary's, London W2 1PG

    EDITOR,—The hypothesis that semen quality has declined is not new, but the current widespread interest dates from the meta-analysis of worldwide studies by Carlsen et al.1 This met with numerous methodological criticisms, which implied that more reliable evidence was required before the merits of the hypothesis could be judged. It is important to look at other measurements, such as sperm motility and morphology, and functional measures of biological fertility (notably time to pregnancy) and to consider general methodological issues such …

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