方法应用回顾性队列调查方法，对全国16个城市4 433名交通警察的健康状况及其影响因素进行了初步调查。
Methods a preliminary investigation of the health status and occupational hazard of4 433traffic policemen on 16 cities in China was performed by using a retrospective cohort method.
方法应用回顾性队列调查方法，对全国16个城市4 433名交通警察的健康状况及其影响因素进行了初步调查。
Methods a preliminary investigation of the health status and occupational hazard of4 433traffic policemen on 16 cities in China was performed by using a retrospective cohort method.
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