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No secular decline in fecundity has occurred in Sweden

BMJ 1994; 309 doi: (Published 08 October 1994) Cite this as: BMJ 1994;309:959
  1. U Hogberg,
  2. M Wulff
  1. Department of Obstetrics and Gynaecology, Umea University, S-901 87 Umea, Sweden
  2. Department of Epidemiology and Public Health, Umea University.

    EDITOR, - Stephen Farrow's editorial highlights the important epidemiological issue of whether human fertility is threatened by environmental pollution or occupational exposure.1 The methodological problems in studies of this are well recognised and include the study design, measures of exposure, reproductive and developmental outcomes, interaction, participation, and recall bias.2 How then could we address the hypothesis of …

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