Abstract:

Objective
To reveal the geographical distribution regularity of normal reference value of young men stroke volume in China,and provide scientific basis for making its unified standard.Methods 3 236 cases of normal young men stroke volume from 68 units in 20 provinces of China were collected.Applying the method of related analysis and regression analysis,the correlations between geographical factors (annual sunshine duration,annual sunshine percentage) and the Chinese normal reference value of young men stroke volume were studied.Results The correlation between geographical factors and the normal reference value of Chinese young men stroke volume was quite significant (F=5.265,P=0.003).Applying the method of Backward in SPSS15.0 software,multiple linear regressions between young men stroke volume and geographical factors were founded,one regression equation was inferred: Y^=1.87+0.022 00X₂+1.002X₃+5.988X₇±14.72.In the above equation,Y^ was normal reference value of Chinese young men stroke volume  (mL),X₂ was annual sunshine duration（h）,X₃ was annual average temperature （℃）,X₇ was annual average wind speed (m·s^-1)，14.72 was the value of the residual standard deviation. Conclusion The normal reference value of Chinese young men stroke volume of some area can be reckoned by using the regression equation.

Key words: stroke volume;normal reference value;geographical factors;related analysis;regression analysis