Evidence map›Paper›PMID 32070249›Full record

ArticleProceedings. Biological sciences2020

No genetic contribution to variation in human offspring sex ratio: a total population study of 4.7 million births.

Brendan P Zietsch, Hasse Walum, Paul Lichtenstein, Karin J H Verweij, Ralf Kuja-Halkola

Abstract read
In one paragraph

Article in Proceedings. Biological sciences, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from 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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed.

  1. Article
  2. Article
  3. Signatures of sex ratio distortion in humans.bioRxiv : the preprint server for biology · 2026
    Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Observable variations in human sex ratio at birth.PLoS computational biology · 2021
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. A test of oscillation in the human secondary sex ratio.Evolution, medicine, and public health · 2020
    Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

5 authors.

Brendan P ZietschCentre for Evolution and Psychology, School of Psychology, University of Queensland, St. Lucia, Brisbane QLD 4072, Australia.
Hasse WalumDivision of Microbiology and Immunology, Yerkes National Primate Research Center, Emory University, 954 Gatewood Rd NE, Atlanta, GA 30329, USA.
Paul LichtensteinDepartment of Medical Epidemiology and Biostatistics, Karolinska Institutet, Nobels väg 12A, 171 77 Stockholm, Sweden.
Karin J H VerweijDepartment of Psychiatry, Amsterdam UMC, location AMC, University of Amsterdam, Meibergdreef 5, 1105 AZ Amsterdam, The Netherlands.
Ralf Kuja-HalkolaDepartment of Medical Epidemiology and Biostatistics, Karolinska Institutet, Nobels väg 12A, 171 77 Stockholm, Sweden.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The ratio of males to females among an individual's offspring at birth (offspring sex ratio) has long been of great interest to evolutionary biologists. The human offspring sex ratio is around 1 : 1 and is understood primarily in terms of Fisher's principle (R. A. Fisher,

Indexed as

Population DynamicsSex RatioFemaleHumansMaleParturitionReproductionResearch DesignSelection, GeneticSocioeconomic FactorsSwedenfamilial aggregationnegative frequency-dependent selectionsex allocationsteroid hormonesTrivers–Willard

Identifiers

PMID32070249
PMCPMC7062014

What OpenQuestion holds

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Registered trials

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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.