ArticleEarly human development2020
The human sex ratio at conception.
Article in Early human development, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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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.
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Who cites it
5 citing papers in PubMed, 12 citations in OpenAlex.
- Sex ratio at birth across 100 years in Sweden and risk of cardiovascular disease and all-cause mortality - a national register study.European journal of epidemiology · 2024Article
- Article
- Gender bias in fetal malformations: A cross-sectional study in Asian populations.Frontiers in endocrinology · 2023Article
- First Trimester of Pregnancy as the Sensitive Period for the Association between Prenatal Mosquito Coil Smoke Exposure and Preterm Birth.International journal of environmental research and public health · 2022Article
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Authors and funding
2 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
A recent study has attempted to estimate the primary sex ratio i.e. the sex ratio at conception, using a variety of studies in the extant literature. Starting with data at birth, the authors projected back in time, estimating foetal loss at each gestational stage. Their overall conclusion was that there are equal numbers of males and females formed at conception. This paper contradicts these estimates using two very large samples of accurately recorded 19th century births. These datasets come from a time when contraception and sex selection were not widely practised. The conclusions are that at the time of conception, there is a substantial excess of males, the excess probably being determined by the hormone levels of both parents in accord with the hormonal hypothesis, and if conditions during pregnancy are stressful, then frail male foetuses will preferentially be culled. In short, more males than females are conceived, and that more males are miscarried, and that more males still survive to birth.
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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.