Figure 9.Pregnancy rate curves grouped according to average pretreatment sperm concentration. The number (n)of patients followed each year is shown. The numbers of men and pregnancies in each sperm concentration group are shown in the inset table (From Baker, H.W.G., Male Infertility. Chapter 141 In Endocrinology, 6th edition, Jameson J. L. and DeGroot L.J. (Chief Eds.), Saunders Elsevier Philadelphia PA. pp 2556-2579, 2010)