Evidence map›Paper›PMID 41093331›Full record

ArticleBMJ open2025

Retrospective study on the 'sex ratio at birth' in Western Sydney Local Health District between 2011 and 2020.

Charmi Perera, Gyan Ainkaran, Beata Gidaszwski, Marjan Khajehei, James Elhindi, Seng Chai Chua

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in BMJ open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing 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

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

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

5 · Who and what money

Authors and funding

6 authors.

Charmi Perera *Westmead Hospital, Westmead, New South Wales, Australia.ORCID http://orcid.org/0000-0003-0453-0781
Gyan Ainkaran *The University of Notre Dame Australia, Sydney, New South Wales, Australia.
Beata GidaszwskiWestmead Hospital Women's & Newborn Health Department, Westmead, New South Wales, Australia.
Marjan KhajeheiWestmead Hospital Women's & Newborn Health Department, Westmead, New South Wales, Australia.
James ElhindiThe University of Sydney, Sydney, New South Wales, Australia.
Seng Chai ChuaWestmead Hospital Women's & Newborn Health Department, Westmead, New South Wales, Australia drchuasc@gmail.com.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveSex selection is not permitted in Australia; however, there are

designThis is a retrospective cohort study.

settingWestern Sydney Local Health District over three maternity hospitals.

participantsA total of 109 931 births between 2011 and 2020, where gender was assigned at birth, were included in the study. PRIMARY AND SECONDARY OUTCOMES MEASURED: The primary outcome measured was the SRB between ethnicities and mode of conception.

resultsThere was a higher male to female SRB for mothers born in China (SRB=1.12) compared with mothers born in Australia (SRB=1.05). Mothers from China were 1.1 times more likely to have a son. Otherwise, there was no significant difference with the SRB according to year, parity and mode of conception.

conclusionAmong the Western Sydney population, mothers born in China show a higher male SRB, reflecting a possible sex preference. However, this study is not without some limitations, for which purpose further study is warranted.

Indexed as

Sex RatioAdultFemaleHumansInfant, NewbornMalePregnancyRetrospective StudiesWestern AustraliaNEONATOLOGYOBSTETRICSREPRODUCTIVE MEDICINE

Identifiers

PMID41093331
PMCPMC12530412

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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.