[Investigation of epidemiological characteristics and influencing factors on dust-exposed working age of pneumoconiosis cases in a city].

To investigate epidemiological characteristics and influencing factors on dust-exposed working years of pneumoconiosis cases in Yantai. In January 2020, By Cluster sampling way, Using descriptive statistics to analyze dust-exposed working years of the reported 3307 new cases of pneumoconiosis from 2009 to 2019 in Yantai. Analyzing the variation trends by the chi-square trend test. Analyzing single fator by chi-square test. Using multiple classification Logistic Regression analysis to analyze multiple influencing factors. The dust-exposed working age of pneumoconiosis cases decreased by years (<0.05) . The starting age of dust exposure of cases increased year by year, while positively correlated with the dust-exposed working age (=-0.217, <0.05) . The years of dust exposure, starting age of dust exposure, industry, type of economy and scale of enterprise were main influence factors on the dust-exposed working age of pneumoconiosis cases. We should strengthen the management on prevention and control condition of pneumoconiosis in metal smelting and processing industry and privately-owned, small and micro enterprises, and pay attention to workers starting exposed to dust in the age of ≥28 years old.