Changing sex ratio in Iran, 1976–2000

Some of these include birth order, race, coital rate, certain hormonal treatment, 1, 2 parental age, 1, 3 and exposure to environmental toxins. 2 Studies on secular trends in the human sex ratio at birth have shown that there are rapid increase during and just after war. 4 The sex ratio can vary bet...

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Bibliographic Details
Published in:Journal of epidemiology and community health (1979) 2002-08, Vol.56 (8), p.622-623
Main Authors: Ansari-Lari, M, Saadat, M
Format: Article
Language:English
Subjects:
Age
Biological and medical sciences
Birth order
Birth Rate
Births
Female
General populations
Humans
Infant, Newborn
Infants
Iran
Male
Measurement
Medical sciences
Population Dynamics
Prevention and actions
Public health. Hygiene
Public health. Hygiene-occupational medicine
Ratios
Sex Ratio
Sexes
Short Report
Studies
Toxins
Tropical medicine
Vivipary
Warfare
World War I
World War II
World wars
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Summary:Some of these include birth order, race, coital rate, certain hormonal treatment, 1, 2 parental age, 1, 3 and exposure to environmental toxins. 2 Studies on secular trends in the human sex ratio at birth have shown that there are rapid increase during and just after war. 4 The sex ratio can vary between populations and changes within populations over time, for example it has been reported that it decreased in recent decades in some countries such as Denmark 5 and the United States 6 and increased in Italy 3 and Japan. 7 There is no investigation about the sex ratio in Iran. Of interest are the animal studies that have suggested that under favourable environmental and maternal conditions male infants would be favoured and the probability of delivering a female infant would increase under unfavourable conditions, 8 which surprisingly seems reasonable to explain the findings of our study.
ISSN:0143-005X
1470-2738
DOI:10.1136/jech.56.8.622