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Fulltext The Disappearing Sperms: Analysis of Reports Published Between 1980 and 2015

Sengupta P, Dutta S, Krajewska-Kulak E

Am J Mens Health, 2017 07;11(4):1279-1304.
PMID: 27099345 DOI: 10.1177/1557988316643383

Reports regarding the changes in sperm concentration in different counties of the world are inconsistent. Furthermore, the reports that sprung up from specific epidemiological and experimental examinations did not include data of prior studies or geographical variations. The current study, following a previous report of massive fall in semen volume over the past 33 years, attempts to delineate the trend of altering sperm concentrations and factors responsible for this by reviewing article published from 1980 to July 2015 with geographic differences. The current study identified an overall 57% diminution in mean sperm concentration over the past 35 years ( r = -.313, p = .0002), which, when analyzed for each geographical region, identified a significant decline in North America, Europe, Asia, and Africa. An increasing trend of sperm concentration was identified only in Australia. The association of male age with such a trend ( R2 = .979) is reported. The authors also correlated male fertility with sperm concentration. Thus, this comprehensive, evidence-based literature review aims to concisely and systematically present the available data on sperm concentration from 1980 to 2015, as well as to statistically analyze the same and correlate male health with the declining pattern of sperm count in a single scientific review to serve the scientific research zone related to reproductive health. It points to the threat of male infertility in times ahead.

Matched MeSH terms: Sperm Count/trends*
Decline in sperm count in European men during the past 50 years

Sengupta P, Borges E, Dutta S, Krajewska-Kulak E

Hum Exp Toxicol, 2018 Mar;37(3):247-255.
PMID: 28413887 DOI: 10.1177/0960327117703690

PURPOSE: To investigate whether the sperm concentration of European men is deteriorating over the past 50 years of time.
MATERIALS AND METHODS: We analysed the data published in English language articles in the past 50 years in altering sperm concentration in European men.
RESULTS: A time-dependent decline of sperm concentration ( r = -0.307, p = 0.02) in the last 50 years and an overall 32.5% decrease in mean sperm concentration was noted.
CONCLUSION: This comprehensive, evidence-based meta-analysis concisely presents the evidence of decreased sperm concentration in European male over the past 50 years to serve the scientific research zone related to male reproductive health.

Matched MeSH terms: Sperm Count/trends*

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