title: No decline in semen quality among potential sperm donors in Sydney, Australia, between 1983 and 2001.
abstract: OBJECTIVE
  To determine whether the quality of semen has changed over time in men screened for semen donation.
  
  
  METHODS
  All 448 men volunteering for semen donation between 1983 and 2001 at a donor insemination clinic in Sydney, Australia, were included in this longitudinal single centre observational analysis of semen parameters. There was no selection for fertility or marital status but all volunteers had to be aged between 18 and 40 years.
  
  
  RESULTS
  There was no change in the total sperm count during the study period (r = 0.065, P = 0.17) using a linear regression model. The ejaculate volume did not change (r = 0.002, P = 0.97), while an increase in sperm motility was seen (Spearman R = 0.194, P < 0.001).
  
  
  CONCLUSIONS
  The semen quality of volunteers for sperm donation presenting to our donor insemination clinic in Sydney between 1983 and 2001 has not declined.
authors.affiliation: School of Women's and Children's Health, Division of Obstetrics and Gynaecology, University of New South Wales, Sydney, Australia. mfcostello@unsw.edu.au
authors.forename: Michael F
authors.initials: MF
authors.lastname: Costello
authors.forename: Peter
authors.initials: P
authors.lastname: Sjoblom
authors.forename: Youala
authors.initials: Y
authors.lastname: Haddad
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Steigrad
authors.forename: Edward G
authors.initials: EG
authors.lastname: Bosch
mesh_terms: D000293:Adolescent; D000328:Adult; D001315:Australia; D006801:Humans; D008297:Male; D012661:Semen; D013075:Sperm Capacitation; D013076:Sperm Count; D013081:Sperm Motility; D013997:Time Factors; D014019:Tissue Donors