title: Normal reference value of red blood cell count of Chinese young men and geographical factors.
abstract: OBJECTIVE
  This paper aims at supplying a scientific basis for unifying the normal reference value standard of red blood cell count of Chinese young men.
  
  
  METHODS
  The research is made to study the relationship between the normal reference value of 41,759 examples of red blood cell count of young men and 8 geographical factors in 334 areas in China, which is determined by the microscopical counting method.
  
  
  RESULTS
  It is found that the correlation of geographical factors and the normal reference value of red blood cell count of young men is quite significant (F = 224.98, P = 0.000). By using the method of stepwise regression analysis, one regression equation is inferred.
  
  
  CONCLUSIONS
  If geographical values are obtained in a certain area, the normal reference value of red blood cell count of young men in this area can be reckoned by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight districts: Northeast China District, North China District, Shanxi-Shaanxi-Inner Mongolia District, Middle and Lower reaches of the Changjiang River District, Southeast China District, Northwest China District, Southwest China District, and Qinghai-Tibet Plateau District.
authors.affiliation: Department of Geography, Shaanxi Normal University, Xi'an, Shaanxi, China. gemiao@snnu.edu.cn
authors.forename: Ge
authors.initials: G
authors.lastname: Miao
authors.forename: Yaping
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jinwei
authors.initials: J
authors.lastname: He
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Yan
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Lixia
authors.initials: L
authors.lastname: Cao
authors.forename: Haiyan
authors.initials: H
authors.lastname: Fu
mesh_terms: D000293:Adolescent; D044466:Asian People; D002681:China / Q000208:ethnology; D004906:Erythrocyte Count / Q000706:statistics & numerical data*; D005843:Geography; D006801:Humans; D008297:Male; D012016:Reference Values; D012044:Regression Analysis; D055815:Young Adult