Xu Tan, Lin Dongdong, Liang Hui, Chen Mei, Tong Weijun, Mu Yongping, Feng Cindy Xin, Gao Yongqing, Zheng Yumei, Sun Wenjie
Department of Epidemiology, School of Public Health, Medical College of Soochow University, Suzhou, Jiangsu 215123, China.
School of Science and Engineering, Tulane University, New Orleans, LA 70112, USA.
Int J Environ Res Public Health. 2014 Aug 11;11(8):8166-74. doi: 10.3390/ijerph110808166.
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.
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.
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.
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.
尽管众多研究报告了出生季节与性别比例之间的关联，但在非西方背景下的亚热带地区开展的研究较少。本研究评估了中国怀孕季节对出生性别比例的影响。
我们于2006年至2008年在中国东北地区开展了一项基于全国人口的回顾性研究，纳入了3175对儿童-父母对。收集并分析了人口统计学数据以及与怀孕和分娩相关的数据。拟合了多元逻辑回归模型，以估计母亲怀孕季节的屈光不正回归系数和95%置信区间（CI），并对潜在混杂因素进行了调整。
在对父母年龄（分界点为30岁）、地区、民族、母亲教育水平和母亲流产史进行调整后，母亲怀孕季节对出生性别存在显著的统计学差异。与春季怀孕的母亲相比，夏季或冬季怀孕的母亲生女孩的概率更高（p<0.05）。出生性别比例随月份而变化。
我们的结果表明，与春季怀孕的母亲相比，夏季和冬季怀孕的母亲更有可能生女孩。怀孕季节可能在出生性别方面发挥重要作用。
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