Respiratory symptoms in British coal miners.

@article{Ashford1970RespiratorySI,
  title={Respiratory symptoms in British coal miners.},
  author={John R. Ashford and Jr. Daniel C. Morgan and Stewart Rae and R. R. Sowden},
  journal={The American review of respiratory disease},
  year={1970},
  volume={102 3},
  pages={
          370-81
        }
}
This report is concerned with the prevalence of certain respiratory symptoms, including persistent cough, persistent phlegm, breathlessness, wheeze, weather affecting the chest, and previous chest illness in a population of approximately 30,000 working coal miners in Great Britain. For each symptom, the prevalence tended to increase with increasing age. By the use of suitable statistical techniques, comparisons were made between the prevalences of different symptoms in the same population and… CONTINUE READING