Investigation And Analysis Of Dust Exposure And Pneumoconiosis In Local Coal Mines Certain Area

Objective: To investigate the incidence of CWP among workers exposed to dust in four coal mines from 1949 to 2019,and to understand the epidemiological characteristics of CWP in the mining area.Methods: The collected data was firstly sorted out by Excel spreadsheet,and then the SPSS 22.0 software was used for mathematical statistical analysis.Univariate analysis of variance was used to compare the differences in the sample mean of age,average age of onset,working age of onset and onset latency.K-W H rank sum test was used for dust concentration.The difference of CWP incidence rate and advanced stage rate among different types,stages,ages and working types was analyzed by 2test or exact probability method.Cox regression was used to analyze the survival factors of patients with CWP.All statistical tests were conducted with a two-sided probability test and the level of 0.05,which indicates the difference is statistically significant.Results: During the 70 years,a total of 299,618 times of workers exposed to dust were reported,and a total of 16792 workers were involved.Among them,11898 workers met the inclusion criteria,and the compliance rate was 70.85%.By August 31,2019,a total of 1228 patients had been diagnosed,with an detection rate of about5.65‰.Among the confirmed cases,896 were stage I,266 were stage II,and 66 were stage III.There were 493 patients with silicosis,288 patients with coal lung and 447 patients with coal silicosis.The average age of onset was 50.49±10.37 years,the average length of service was 28.36±6.69 years,and the average latency was26.84±20.29 years.Statistical analysis showed that there were statistically significant differences in the average age of onset,average length of service and average latency among different periods,types of work,native places,age of diagnosis and living conditions.The number of deaths was mainly from 1986 to 2005,accounting for68.77% of the total number of deaths,and the top three deaths were caused by cancer,tuberculosis and pulmonary heart disease.Among 1228 patients,91 patients were complicated with pulmonary tuberculosis,and the tuberculosis complicated rate in CWP patients was 7.41%.Conclusion: CWP is the most important occupational disease in coal mines in this area.Stage 1 and silicosis patients are the majority,mixed workers account for the majority,and the onset age is mainly in 40-60 years old.Dust exposure year is the most important risk factor for death of patients with CWP.Combined tuberculosis and pulmonary heart disease is one of the main causes of death of CWP in coal mines in this area,and cancer is the first cause of death.