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Collective investigations of fertility in childless married couples were carried out in 9 andrological health centres of the GDR. Analysis of 1937 spermatograms in comparison to fertility after 1 to 2 years shows: (1) Fertility decreases significantly at sperm density nearly 10 million per ml. (2) Motility below 60 per cent caused reduced fertility. Normal motility is more important than normal density of spermatozoa. (3) Fructose level doesn't correlate to motility or fertility of man.
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