The association between season of pregnancy and birth-sex among Chinese

Tan Xu, Dongdong Lin, Hui Liang, Mei Chen, Weijun Tong, Yongping Mu, Cindy Xin Feng, Yongqing Gao, Yumei Zheng, Wenjie Sun

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Objective: although numerous studies have reported the association between birth season and sex ratio, few studies have been conducted in subtropical regions in a non-Western setting. The present study assessed the effects of pregnancy season on birth sex ratio in China. Methods: We conducted a national population-based retrospective study from 2006-2008 with 3175 children-parents pairs enrolled in the Northeast regions of China. Demographics and data relating to pregnancy and birth were collected and analyzed. A multiple logistical regression model was fitted to estimate the regression coefficient and 95% confidence interval (CI) of refractive error for mother pregnancy season, adjusting for potential confounders. Results: After adjusting for parental age (cut-off point was 30 years), region, nationality, mother education level, and mother miscarriage history, there is a significant statistical different mother pregnancy season on birth-sex. Compared with mothers who were pregnant in spring, those pregnant in summer or winter had a high probability of delivering girls (p < 0.05). The birth-sex ratio varied with months. Conclusions: Our results suggested that mothers pregnant in summer and winter were more likely to deliver girls, compared with those pregnant in spring. Pregnancy season may play an important role in the birth-sex.

Original languageEnglish
Pages (from-to)8166-8174
Number of pages9
JournalInternational Journal of Environmental Research and Public Health
Volume11
Issue number8
DOIs
StatePublished - 11 Aug 2014
Externally publishedYes

Keywords

  • Birth-sex
  • China
  • Season

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