Blood lead levels of traffic police in Suzhou city and the correlative factors

Objective: To investigate the blood lead levels of traffic police in Suzhou city and the correlative factors.Methods: The blood lead levels of the traffic police in Suzhou and the correlative factors were studied.A mono-factor correlation analysis and multiple stepwise regression analysis were carried out to analyze the possible factors affecting blood lead levels(Ŷ),such as outdoor-on-duty years(X1),hemoglobin(X2),smoking(X3) and blood zinc(X4).Results: The average levels of blood lead and urine lead of the traffic police were 119.79 and 6.99 μg/L respectively,which were significantly higher than those of the controls(88.38 and 5.34(μg/L))(P<0.001 and P<0.01).In mono-factor correlation analysis,the blood lead levels showed a positive correlation with outdoor-on-duty years(P<0.001),and a negative correlation with concentrations of hemoglobin(P<0.001).In multiple stepwise regression analysis,the regression equation was established as Ŷ=132.95+0.93X1-0.86X2+7.37X3+14.30X4.Conclusions: It suggests that the blood lead levels rise with the increase of outdoor-on-duty years,and the synthesis of hemoglobin is inhibited to a certain extent.