Graph of Sperm Count 1938 to 1990
Linear regression of mean sperm density reported in 61 publications (represented by circles the area of which is proportional to the logarithm of the number of subjects in the study), each weighted according to number of subjects, 1938-1990. The figure is based on the data reported by Carlsen et al.1. A corresponding figure in that paper was incomplete.
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1Carlsen E, Giwercman A, Keiding N, Skakkebęk NE. Evidence for decreasing quality of semen during past 50 years. Br Med J 305:609-613 (1992).
graph source: Figure 1 in Male Reproductive Health and Environmental Xenoestrogens: Toppari, J., J. Larsen, P. Christiansen, A. Giwercman, P Grandjean, L.J. Guillette Jr., B. Jegou, T.K. Jensen, P. Jouannet, N. Keiding, H. Leffers, J.A. McLachlan, O. Meyer, J. Muller, E. Rajpert-De Meyts, Thomas Scheike, R. Sharpe, J. Sumpter, and N.E. Skakkebaek. 1996. Male Reproductive Health and Environmental Xenoestrogens. Environmental Health Perspectives 104(Suppl 4):741-803.
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