Have sperm counts been reduced 50 percent in 50 years? A statistical model revisited.

@article{Olsen1995HaveSC,
  title={Have sperm counts been reduced 50 percent in 50 years? A statistical model revisited.},
  author={Geary W. Olsen and Kenneth M. Bodner and J M Ramlow and Charles E. Ross and Larry I. Lipshultz},
  journal={Fertility and sterility},
  year={1995},
  volume={63 4},
  pages={887-93}
}
OBJECTIVE To reanalyze data that were used in a linear model to predict that mean sperm counts have been reduced globally by approximately 50% in the last 50 years. DESIGN The mean sperm counts and their temporal distribution were reanalyzed via several different statistical models (quadratic, spline fit, and stairstep). CONCLUSION There are several reasons why a published linear regression model is inappropriate to infer a 50% reduction in mean sperm counts in the last 50 years. These… CONTINUE READING

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