ArticleInternational journal of environmental research and public health2014
The association between season of pregnancy and birth-sex among Chinese.
Article in International journal of environmental research and public health, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 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
3 citing papers in PubMed.
- Using Non-Invasive Methods to Choose Gender; Sex Selection with Diet and Determination of Ovulation Time in Iran.Iranian journal of public health · 2022Article
- Season of birth, sex and sleep timing preferences.International journal of environmental research and public health · 2015Article
- Induced Abortion among Chinese Women with Living Child-A National Study.Advances in disease control and preventionArticle
Corrections and comments
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Authors and funding
10 authors.
Funding
Abstract
objectivealthough 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.
methodsWe 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.
resultsAfter 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.
conclusionsOur 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.
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