Normal reference value of whole blood viscosity (230 s− 1) of old women and geographical factors

If geographical values are obtained in a certain area, the normal reference value of whole blood viscosity (230 s− 1) of old women in this area can be obtained by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and lower reaches of the Yangtze River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.