Are sperm counts declining? Or did we just change our spectacles?

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

13 citing papers in PubMed, 1 synthesis or guideline pooled it.

1. Temporal trends in equine sperm progressive motility: a systematic review and meta-regression.Reproduction (Cambridge, England) · 2023
   Pooled it
2. Recent decline in sperm motility among donor candidates at a sperm bank in Denmark.Human reproduction (Oxford, England) · 2024
   Article
3. Lab-based semen parameters as predictors of long-term health in men-a systematic review.Human reproduction open · 2024
   Review
4. Are There Differences between Methods Used for the Objective Estimation of Boar Sperm Concentration and Motility?Animals : an open access journal from MDPI · 2023
   Article
5. Decline of Sperm Quality over the Last Two Decades in the South of Europe: A Retrospective Study in Infertile Patients.Biology · 2022
   Article
6. Systematic Analysis of Breed, Methodological, and Geographical Impact on Equine Sperm Progressive Motility.Animals : an open access journal from MDPI · 2021
   Review
7. Independent and combined effects of diethylhexyl phthalate and polychlorinated biphenyl 153 on sperm quality in the human and dog.Scientific reports · 2019
   Article
8. Environmental chemicals impact dog semen quality in vitro and may be associated with a temporal decline in sperm motility and increased cryptorchidism.Scientific reports · 2016
   Article
9. The sperm's tale.Investigative genetics · 2014
   Article
10. Semen analysis standardization: is there any problem in Polish laboratories?Asian journal of andrology · 2013
    Article
11. Falling sperm counts and global oestrogenic pollution: postscript.Asian journal of andrology · 2013
    Review
12. The reference values for semen parameters of 1213 fertile men in Guangdong Province in China.Asian journal of andrology
    Article
13. Evaluation of semen quality in 1808 university students, from Wuhan, Central China.Asian journal of andrology
    Article

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

Authors and funding

1 author.

Funding

No grant is acknowledged in the PubMed record.

Abstract

PubMed holds no abstract for this paper.

Indexed as