OBJECTIVE: To determine whether there has been a decline in semen quality in a group of healthy men during the past 21 years. DESIGN: Retrospective analysis of the relationship between time and changes in semen parameters over 21 years using regression analysis. SETTING: A tertiary university center. PATIENTS: Five hundred ten healthy, normal men who donated multiple semen samples as participants in clinical studies between 1972 and 1993. MAIN OUTCOME MEASURES: Sperm concentration, semen volume, total numbers of sperm per ejaculate, and percent spermatozoa with normal morphology. RESULTS: There was no decrease in sperm concentration, semen volume, total number of sperm per ejaculate, and percent normal sperm morphology in 510 healthy men studied between 1972 and 1993. CONCLUSION: We conclude that in this population of healthy young men there has not been any decline in semen quality in the past 21 years.
OBJECTIVE: To determine whether there has been a decline in semen quality in a group of healthy men during the past 21 years. DESIGN: Retrospective analysis of the relationship between time and changes in semen parameters over 21 years using regression analysis. SETTING: A tertiary university center. PATIENTS: Five hundred ten healthy, normal men who donated multiple semen samples as participants in clinical studies between 1972 and 1993. MAIN OUTCOME MEASURES: Sperm concentration, semen volume, total numbers of sperm per ejaculate, and percent spermatozoa with normal morphology. RESULTS: There was no decrease in sperm concentration, semen volume, total number of sperm per ejaculate, and percent normal sperm morphology in 510 healthy men studied between 1972 and 1993. CONCLUSION: We conclude that in this population of healthy young men there has not been any decline in semen quality in the past 21 years.
Authors: W Himmel; E Ittner; M M Kochen; H W Michelmann; B Hinney; M Reuter; M Kallerhoff; R H Ringert Journal: Br J Gen Pract Date: 1997-02 Impact factor: 5.386
Authors: Michael F Costello; Peter Sjoblom; Youala Haddad; Stephen J Steigrad; Edward G Bosch Journal: J Assist Reprod Genet Date: 2002-06 Impact factor: 3.412