Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Parental smoking and increased likelihood of female births

(2010) Parental smoking and increased likelihood of female births. Annals of Human Biology. pp. 789-800. ISSN 0301-4460

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Abstract

Background: A recent decline in the male: female (M:F) sex ratio may relate to pregnancy cigarette smoke exposure. Aim: To assess trends and cigarette exposure dose-response effects on the sex ratio. Subjects and methods: A retrospective analysis was carried out of deliveries at the Liverpool Women's Hospital between 1998 and 2003, and of deliveries reported in community surveys from the same area in 1998 and 2006. Results: For the hospital sample, the M: F sex ratio was 1.14 if no parent smoked, and 0.77 when both parents smoked during the mother's pregnancy (p < 0.001). Heavy maternal smokers (> 10 cigarettes per day) were more likely to deliver a female baby than light smokers (p < 0.001). Smoking was associated with increased likelihood of female birth controlling for birth year, socio-economic status, alcohol exposure, maternal haemoglobin and body mass index (adjusted OR: 1.41, 95 CI 1.12-1.92, p < 0.001). In the community sample controlling for socio-economic status the ratios were 1.13 (95 CI 1.03-1.24, p = 0.015) in 1998 and 1.31 (95 CI 1.16-1.48, p < 0.001) in 2006. Secular trends showed decreasing ratios in hospital and community samples for both smokers and non-smokers. Conclusion: Pregnancy cigarette smoking increased the proportion of female births with evidence for a dose-response association.

Item Type: Article
Keywords: Sex ratio female birth Liverpool smoking pregnancy parental offspring sex-ratio periconceptional smoking maternal smoking newborn-infants pregnancy seasonality association hypothesis childhood countries Anthropology Life Sciences & Biomedicine - Other Topics Public, Environmental & Occupational Health
Page Range: pp. 789-800
Journal or Publication Title: Annals of Human Biology
Journal Index: ISI
Volume: 37
Number: 6
Identification Number: https://doi.org/10.3109/03014461003742803
ISSN: 0301-4460
Depositing User: مهندس مهدی شریفی
URI: http://eprints.medilam.ac.ir/id/eprint/878

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