Objective To analyze the characteristics of pneumoconiosis incidents in Yinzhou District,Ningbo,Zhejiang Province and to provide basis for developing pneumoconiosis prevention measures.
Methods Pneumoconiosis disease report cards were retrieved from Yinzhou District Center for Disease Control and Prevention (2003-2005) and health hazards monitoring network system (2006-2012) for statistical analysis.
Results A total of 279 new cases of pneumoconiosis were reported in this district from 2003 to 2012.The male to female ratio was 4.7:1,the average age was (41.2& #177;8.6) years old,and the length of occupational dust exposure was (8.4& #177;4.1) years.The other descriptive parameters were silicosis (99.3%),working in small enterprises (74.2%),private sectors (89.2%),light industry and machinery industry (55.6% and 41.2%,respectively).The age of pneumoconiosis onset and the length of dust exposure in the migrant workers were shorter than those of the local workers (t=7.16,P < 0.01;t'=5.68,P < 0.01,respectively),and the same results were also reported in patients working for light industry in comparison with machinery industry and mineral product manufacturing industry (LSD-test,P < 0.01).Moreover,the machinery industry accounted for over 50% of yearly pneumoconiosis incidents since 2005.
Conclusion Yinzhou District reports pneumoconiosis incidences with features of young disease onset age,short exposure length,as well as industrial and regional clustering.Migrant workers should be the target population for pneumoconiosis prevention.
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