Results cannot be generalised

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7048.43b (Published 06 July 1996) Cite this as: BMJ 1996;313:43
  1. Stephen Farrow
  1. Professor Barnet Health Authority, Colindale Hospital, London NW9 5HB

    EDITOR,—I have been trying to understand the method of analysis used by Stewart Irvine and colleagues to assess sperm quality in their birth cohort study.1 I think that they have not adequately taken account of possible confounding factors and have reached conclusions that are untenable.

    The subjects were volunteer donors recruited in different ways–from antenatal parent craft groups, undergraduates, and personal contacts of existing donors. Given the diverse nature of those recruited, the authors must have analysed the …

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