Spatiotemporal trends in human semen quality.

ABSTRACT: Over the past four decades, studies of various designs have reported spatial and temporal trends in human semen quality. Several standardized-methodology studies in homogeneous populations that compare specific cities within a country or a continent provide clear evidence of geographical differences in sperm production, even over short distances within the same country. Human sperm production is widely believed to be declining over time, but evidence from the scientific literature is less clear. Studies based on repeated cross-sectional data from a single centre have shown mixed results. Among the numerous retrospective studies conducted in a single centre, only some included homogeneous groups of men and appropriate methods, and most of them suggest a temporal decrease in human sperm prod

SUBMITTER: Auger J 

PROVIDER: S-EPMC9383660 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature