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近十余年来,我国各地进一步大力开展计划生育工作,生育率明显下降,人口年龄结构也随出生率的变化而有明显改变。固然,影响人口年龄性别结构变化的不仅是出生,各年龄别死亡率的变化也是影响人口年龄性别结构变化的重要因素之一。医学领域非常注意研究各不同年龄的生理特点及健康问题,因而人口年龄结构
In the past ten years and more, the work of family planning in China has been vigorously carried out. The fertility rate has obviously dropped. The age structure of the population has also changed significantly with the birth rate. Of course, not only the changes in the gender structure affecting the population age but also the changes in the age-specific mortality rate are also one of the important factors that affect the age-gender structure of the population. The medical field pays great attention to the study of physiological characteristics and health problems of different ages, so the population age structure