SynthesisAfrican health sciences2017
Evidence for decreasing sperm count in African population from 1965 to 2015.
Synthesis in African health sciences, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
49 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Global trends in semen quality of young men: a systematic review and regression analysis.Journal of assisted reproduction and genetics · 2023Pooled it
- Pyrethroids Toxicity to Male Reproductive System and Offspring as a Function of Oxidative Stress Induction: Rodent Studies.Frontiers in endocrinology · 2021Pooled it
- The influence of different bariatric surgeries on male sex hormones and semen parameters among infertile obese male patients: an observational study.BMC surgery · 2026Observational
- Environmental determinants of male infertility: emerging threats and technological interventions.Frontiers in medicine · 2026Review
- Therapeutic effect ofRSC advances · 2025Article
- Body fat distribution and semen quality in 4304 Chinese sperm donors.Asian journal of andrology · 2025Article
- Impact of SARS-CoV-2 on the male reproductive tract: insights from semen analysis and cryopreservation.Journal of assisted reproduction and genetics · 2025Article
- Lower Semen Quality Among Men in the Modern Era-Is There a Role for Diet and the Microbiome?Microorganisms · 2025Review
- Semen quality of male partners of infertile couples attending a private specialist infertility hospital in Kumasi, Ghana: a retrospective descriptive analysis.The Pan African medical journal · 2025Article
- Association between obstructive sleep apnea and male reproductive function: a cross-sectional study with stratified analysis.Frontiers in endocrinology · 2025Article
- Impact of Endocrine Disruptors on the Genitourinary Tract.Journal of xenobiotics · 2024Review
- Review
- The relationship between anthropometric and metabolic risk factors and testicular function in healthy young men.Clinical and experimental reproductive medicine · 2024Article
- Association of Urinary Mycotoxins with Sperm Quality: A Case-Control Study in Southern Nigeria.Toxins · 2024Article
- Frequency, morbidity and equity - the case for increased research on male fertility.Nature reviews. Urology · 2024Review
- What is driving the global decline of human fertility? Need for a multidisciplinary approach to the underlying mechanisms.Frontiers in reproductive health · 2024Review
- Rare Earth and Platinum Group Elements In Sub-Saharan Africa and Global Health: The Dark Side of the Burgeoning of Technology.Environmental health insights · 2024Review
- Exposure to Fine Particulate Matter Constituents and Human Semen Quality Decline: A Multicenter Study.Environmental science & technology · 2023Article
- Trends in semen parameters of infertile men in South Africa and Nigeria.Scientific reports · 2023Article
- Changes in Semen Analysis over Time: A Temporal Trend Analysis of 20 Years of Subfertile Non-Azoospermic Men.The world journal of men's health · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThis meta-analysis, following our previous reports those documented an overall 57% diminution in mean sperm concentration around the globe over past 35 years and 32.5% decline in past 50 years in European population, attempts to report the declining trend of sperm concentrations in African population between 1965 and 2015.
methodsIn the course of retrieval of data following MOOSE guidelines and PRISMA checklist, we found a total of fourteen studies that have been conducted during that period on altering sperm concentration in the African male.
resultsFollowing analysis of the data, a time-dependent decline of sperm concentration (r = -0.597, p = 0.02) and an overall 72.6% decrease in mean sperm concentration was noted in the past 50 years. The major matter of concern is the present mean concentration (20.38×106/ml) is very near to WHO cut-off value of 2010 of 15×106/ml. Several epidemic diseases, genital tract infection, pesticides and heavy metal toxicity, regular consumption of tobacco and alcohol are reported as predominant causative factors.
conclusionThis comprehensive, evidence-based meta-analysis and systematic review concisely presents the evidence of decreased sperm concentration in the African male over past 50 years with possible causative factors to serve the scientific research zone related to male reproductive health.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.