Abstract: Objective To analyze the health status of benzene exposed workers in Tianjin,provide a scientific basis for the development of preventive and control measures for occupational diseases in the city. Methods The information on occupational health surveillance in Tianjin in 2020 were collected,10 658 workers working in benzene operations were selected as the exposed group,and 10 658 workers working in non-benzene operations were selected as the control group by the matching method. The data on age,length of service,gender,economic type of enterprise,enterprise size,industry classification,and region to which the employer belongs were collected. The univariate and multivariate unconditional logistic regression were used to analyze the relationship between basic information,occupational history,enterprise information of benzene exposed workers and workers' abnormal hemogram. Results The rate of abnormal hemogram in the benzene exposed group was 3.26%,which was higher than that in the control group（2.38%）,with a statistically significant difference（χ²=14.809,P<0.01）. The univariate logistic regression analysis showed that benzene exposed workers who are female（OR=2.79,95%CI：2.25-3.47,P<0.01）,long working age（OR=1.04, 95%CI：1.03-1.05,P<0.01）,and enterprises whose employer's region was suburban（OR=1.49,95%CI：1.12-1.97,P<0.01） had the higher risk of abnormal hemogram. The multivariate unconditional logistic regression showed that benzene exposed workers who are female（OR=3.01,95%CI：2.41-3.77,P<0.01）,long working age（OR=1.09,95%CI：1.07-1.11,P<0.01）,young age（OR=0.95, 95%CI：0.93-0.96,P<0.01）,micro-enterprises（OR=2.18,95%CI：1.13-4.17,P<0.05）,small enterprises（OR=1.66,95%CI：1.17-2.37,P<0.01）,and enterprises whose employer's area was suburban（OR=1.46,95%CI：1.09-1.95,P<0.05） had the higher risk of abnormal hemogram. Conclusion In Tianjin,it is necessary to focus on the abnormal hemogram of benzene-exposed workers of female and high working age group,strengthen the health promotion and education in the lower age group,pay attention to the supervision and management of micro and small enterprises and enterprises with employers in suburban areas,and conduct regular occupational health examination for benzene-exposed workers,to protect the health of benzene-exposed workers.

Key words: Benzene, Occupational health examination, Blood cells