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目的为制定中国中老年人红细胞压积的统一标准提供科学依据。方法收集了中国各地用温氏法测定的健康中老年人红细胞压积，并对其与地理因素的关系进行了研究，用逐步回归分析的方法推导出了２个回归方程。结果发现海拔高度是影响中老年人红细胞压积最主要的因素，随着海拔高度的逐渐增大，中老年人红细胞压积也在逐渐的增大，相关性很显著。如果知道了中国某地的地理因素，就可以用回归方程估算这个地区的中老年人红细胞压积。结论依据中老年人红细胞压积与地理因素的依赖关系把中国分为青藏区、西南区、西北区、东南区、华北区及东北区等６个区。
Objective To provide a scientific basis for the development of a uniform standard of hematocrit in Chinese middle-aged and elderly people. Methods The hematocrit of healthy middle-aged and elderly people in different parts of China was collected. The relationship between them and geographical factors was also studied. Two regression equations were deduced by stepwise regression analysis. The results showed that altitude was the most important factor affecting the hematocrit in middle-aged and elderly people. With the gradual increase of altitude, the hematocrit of middle-aged and elderly people also gradually increased, and the correlation was significant. If you know the geographical factors of a place in China, you can use regression equations to estimate the area of the elderly hematocrit. Conclusion Based on the relationship between hematocrit and geographical factors in middle-aged and elderly people, China is divided into 6 districts including Qinghai-Tibet, Southwest, Northwest, Southeast, North China and Northeast China.