Statistical
Descriptive statistical analysis was used for data on the characteristics and concentration of blood biological markers of gasoline workers. Exposure risk ratio of benzene obtained were compared to the Biological Exposure Indices (BEI). While,the linear regression was used to analyze the partial correlation of blood BTEX and relations between blood BTEX and biological parameters of gasoline workers. All the statistical analyses were performed using SPSS 17.0 for Windows Program.