ArticleFertility and sterility2021
Are worldwide sperm counts declining?
Article in Fertility and sterility, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
24 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Global trends in semen quality of young men: a systematic review and regression analysis.Journal of assisted reproduction and genetics · 2023Pooled it
- The sperm survival switch: circRNA-mediated regulatory loops control apoptotic signalling in human spermatozoa.Cell death discovery · 2026Article
- Thyroid stimulating hormone (TSH): does it live up to its promises in the andrology laboratory?Basic and clinical andrology · 2026Article
- Trends in Semen Quality: A Contrasting Perspective From a Single-Centre Review in Ireland.Andrology · 2026Article
- The Global Decline in Sperm Count and Testosterone Levels: Trends, Mechanisms, and Environmental Drivers.Antioxidants (Basel, Switzerland) · 2026Review
- Associations Between Perceived Stress and Sperm DNA Methylation Among Men Attending a Fertility Center.Andrology · 2026Article
- Integrating Sperm Microscopy, Environmental Exposures, and Lifestyle Factors for Male Fertility Analysis: Protocol for the Nippon Semen and Environmental Exposure Database (N-SEED) Cross-Sectional Study.JMIR research protocols · 2026Article
- Extraction, Characterization, and Biological Evaluation of Atranorin Against Diabetes-Induced Reproductive Dysfunction Through Modulation of Oxidative Stress, Inflammatory Pathways and Key Reproductive Enzymes.International journal of molecular sciences · 2026Article
- Microplastics crossing the blood-testis barrier: A call to action for urological research.Current urology · 2026Article
- A primordial germ cell-like-cell platform enables CRISPRi screen for epigenetic fertility modifiers.EMBO reports · 2025Article
- Article
- Non-Targeted Analysis of Environmental Contaminants and Their Associations with Semen Health Factors in Men from New York City.Environment & health (Washington, D.C.) · 2025Article
- Review
- Exposome Profiling of Environmental Pollutants in Seminal Plasma and Novel Associations with Semen Parameters.Environmental science & technology · 2024Article
- Recent decline in sperm motility among donor candidates at a sperm bank in Denmark.Human reproduction (Oxford, England) · 2024Article
- Declining global fertility rates and the implications for family planning and family building: an IFFS consensus document based on a narrative review of the literature.Human reproduction update · 2024Review
- Frequency, morbidity and equity - the case for increased research on male fertility.Nature reviews. Urology · 2024Review
- Current global status of male reproductive health.Human reproduction open · 2024Review
- Geographic Differences in Semen Quality among a Cohort of American Men Using Mail-in Sperm Testing Kits.The world journal of men's health · 2023Article
- Low-polarity untargeted metabolomic profiling as a tool to gain insight into seminal fluid.Metabolomics : Official journal of the Metabolomic Society · 2023Article
Corrections and comments
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Authors and funding
7 authors.
Funding
Abstract
PubMed holds no abstract for this paper.
Indexed as
Identifiers
34836581What OpenQuestion holds
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.