我国出生性别比例与海拔相关的四个台阶  

Birth sex ratios and altitude - related four footsteps in China

作　　者：谷祖善[1] 

机构地区：[1]石河子大学医学院一附院妇产科,新疆石河子832008

出　　处：《中国性科学》2004年第4期5-7,共3页Chinese Journal of Human Sexuality

摘　　要：目的:探索出生性比与地形的关系。方法:以三次全国人口普查的各省市自治区的出生男女婴为样本进行统计分析。结果:发现我国出生性比有很强的规律性,全国可以划为四个台阶;前三个台阶与海拔密切相关,即随海拔的下降而出生性比渐增,即平原生男孩多于高原,但上海、北京等大城市出生性比又大降,这在相距20年的三次普查中结果极其相似。结论:海拔内涵复杂,至少包括经济、文化、习俗、民族、环境、气候等因素;随着经济发达水平的提高,出生性比呈鞍形变化。Objective: To investigate the relationship between birth sex ratios and topography. Methods: Male and female infants born in all municipalities, provinces and autonomous regions in China registered in the third nationwide population census were used as a grand sample and statistically analyzed. Results: A strong regularity was found in birth sex ratios in China, which can be categorized into four footsteps. The former three steps are closely related to altitude, i.e. the birth sex ratios increase with decreasing altitude, or baby boys born in plain regions are more in number than in altitude. In the metropolis, however, such as Shanghai and Beijing, the birth ratios greatly decline. Such results were invariably obtained in the past three census conducted in a period of 20 years. Conclusions: The connotation of altitude is complex, including at least economical, cultural, custom, nationality, environmental and climatic factors. Along with economical development, the birth sex ratios tend to change in saddle - like shape.

关 键 词：中国 出生性别比例 海拔 人口普查 第二性别比 

分 类 号：C92[社会学—人口学]