title: [Survival analysis of patients with pneumoconiosis from 1956 to 2010 in Changsha].
abstract: OBJECTIVE
  To investigate the survival rate and life expectancy of patients with pneumoconiosis and influence factors in Changsha from 1956 to 2010.
  
  
  METHODS
  A total of 3685 patients with pneumoconiosis were diagnosed and reported from 1956 to 2010 in Changsha. The fatality rate and life expectancy were analyzed by life table and the cause of death was analyzed by Kaplan-Meier method and Cox regression model.
  
  
  RESULTS
  The death rate increased obviously with age. Age and accumulation death probability showed linearity (Ŷ=1.271+0.041X, r=0.989). The life expectancy was 60.12 years. The first cause of death was pulmonary tuberculosis in patients with pneumoconiosis. Ruling out the influence of pulmonary tuberculosis, pneumoconiosis, and lung source heart disease, the life expectancy of patients with pneumoconiosis averagely extended 0.83, 0.99, and 0.02 years. The death rate of pneumoconiosis-tuberculosis had significant difference with that of the pneumoconiosisnontuberculosis (P<0.01). Cox regression analysis revealed that the main risk factors for the survival of patients with pneumoconiosis included type of work (smashing worker), complication with tuberculosis, type of pneumoconiosis (silicosis). The death hazard ratio or relative risk caused by them was 1.927, 1.749, and 1.609, respectively.
  
  
  CONCLUSIONS
  Prevention of pneumoconiosis should focus on smashing workers in Changsha, while its the treatment primarily attaches importance to complication of tuberculosis and lung infection.
authors.affiliation: Department of Epidemiology and Health Statistics, Public Health School of Central South University, Changsha, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Xue
authors.forename: Lizhang
authors.initials: L
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D002423:Cause of Death; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008017:Life Expectancy; D008297:Male; D008875:Middle Aged; D011009:Pneumoconiosis / Q000150:complications / Q000453:epidemiology / Q000401:mortality*; D015995:Prevalence; D016016:Proportional Hazards Models; D012307:Risk Factors; D016019:Survival Analysis; D014397:Tuberculosis, Pulmonary / Q000150:complications