National chronic respiratory disease mortality study. I. Prevalence and severity at death of chronic respiratory diseases in the United States, 1963.

Adult Age Factors Aged Asthma/mortality Bronchitis/mortality Chronic Disease Death Certificates Female Forensic Medicine Humans Male Middle Aged Pulmonary Emphysema/mortality Pulmonary Fibrosis/mortality Respiratory Tract Diseases/mortality Sex Factors Surveys and Questionnaires United States Vital Statistics