Constant decline in sperm concentration in infertile males in an urban population: experience over 18 years.
OBJECTIVE
To investigate semen quality in infertile men from an urban population over an 18-year period.


METHODS
Retrospective study.


METHODS
Andrology clinic at a city university hospital.


METHODS
A total of 9,327 men were referred to the clinic for infertility investigation. After excluding those with azoospermia, 7,780 samples were evaluated.


METHODS
Semen samples were analyzed within half an hour of production using computer-automated semen analysis and phase microscopy.


METHODS
Sperm concentration, morphology, and motility; semen pH and leukocyte concentration; and patient age.


RESULTS
The median patient age over the study period was 31.6 years, with an increase from 30.8 years in 1986 to 34.4 years in 2003. The median sperm concentration was 10.25 million/mL for the entire period, with a decline from 27.75 million/mL in 1986 to 4.60 million/mL in 2003. The median proportion of normally shaped spermatozoa was 15%, and the proportion of motile spermatozoa was 21%. The pH increased from 7.4 in 1986 to 7.9 in 2003, and the median leukocyte concentration was 1.50 million/mL.


CONCLUSIONS
A constant decline in median sperm concentration was found in the infertile men. The reason for this remains unclear, although the high pH and leukocyte concentration indicates the involvement of infection.
Lackner
Jakob
J
Department of Urology, Medical University of Vienna, Vienna, Austria. jakob.lackner@meduniwien.ac.at
Schatzl
Georg
G
Waldhör
Thomas
T
Resch
Katharina
K
Kratzik
Christian
C
Marberger
Michael
M
D000328:Adult; D017677:Age Distribution; D001317:Austria / Q000453:epidemiology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007248:Infertility, Male / Q000453:epidemiology* / Q000209:etiology / Q000473:pathology; D007958:Leukocyte Count; D008297:Male; D012189:Retrospective Studies; D013076:Sperm Count / Q000706:statistics & numerical data* / Q000639:trends*; D013081:Sperm Motility; D013094:Spermatozoa / Q000473:pathology; D014505:Urban Population / Q000706:statistics & numerical data*