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25) The data in table below are from an epidemiological study of chronic respiratory disease. Researchers collected information on subjects’ exposure to general air pollution, exposure to pollution in their jobs, and whether they smoked. The response measured was chronic respiratory disease status. Subjects were assigned to one of four possible categories:

Level I: no symptoms

Level II: cough or phlegm less than three months a year

Level III: cough or phlegm more than three months a year

Level IV: cough and phlegm plus shortness of breath more than three months a year

 

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