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Estrogens and falling sperm counts.

D J Handelsman1

  • 1ANZAC Research Institute, University of Sydney, Concord Hospital, NSW, Australia. djh@med.usyd.edu.au

Reproduction, Fertility, and Development
|January 22, 2002
PubMed
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Recent claims of falling human sperm counts and male reproductive health decline are not supported by current evidence. A flawed meta-analysis prompted these claims, but studies show no significant changes over time.

Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Andrology

Background:

  • Concerns exist regarding a potential decline in human sperm counts and male reproductive health.
  • Global exposure to environmental estrogens is often cited as a primary cause.

Purpose of the Study:

  • To review the evidence supporting claims of falling human sperm counts.
  • To evaluate the role of environmental estrogens in male reproductive health.
  • To assess the impact of prenatal diethylstilbestrol exposure on male fertility.

Main Methods:

  • Critical review of a meta-analysis by Carlsen et al. (1992) on human sperm counts.
  • Analysis of studies on the effects of prenatal estrogen exposure (diethylstilbestrol) on male reproductive development.
  • Examination of population-based data and cancer registry trends for male reproductive health indicators.

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Main Results:

  • The meta-analysis claiming falling sperm counts is invalidated by methodological flaws, including study heterogeneity and inappropriate statistical analysis.
  • Studies of individuals exposed prenatally to high doses of diethylstilbestrol show no adverse effects on fertility or sperm output.
  • While some countries show an increase in testicular cancer, population-based evidence for widespread deterioration in male reproductive health, including hypospadias or cryptorchidism, is lacking.

Conclusions:

  • Current evidence does not substantiate claims of declining human sperm counts or a general deterioration in male reproductive health.
  • Further research requires valid, population-based studies using surrogate variables for male fertility.
  • Prenatal estrogen exposure is unlikely to be a significant factor in any purported decline in male fertility or sperm output.