Document byy90RjbNkq3kNpjL2y2onY4Z

appeared that the time required for the production of lung cancer follow ing exposure was considerably greater than the time required for the production of asbestosis. Tables 1 and 2 summarize some of the results reported earlier. Table 1 represents the results of following 21, 755 white males for a period up to 15 1/2 years with work experience in one of three groups of asbestos products industries. Environmental data for these industries indicate that average asbestos dust exposures range from modest in the asbestos building products industry to fairly high in the asbestos textile products industry. Table 1 shows that both "asbestos lung cancer" deaths (defined as the absolute excess in lung cancer deaths over an expected number of deaths based upon experience of white males in the entire United States) and asbestosis deaths are related to levels of exposure in industry. It appears that this relationship is considerably stronger for asbestosis than for lung cancer, with modest levels of exposure produc ing about as much lung cancer as asbestosis while high levels produce considerably more asbestosis than lung cancer. Table 1 U. S. ASBESTOS PRODUCTS WORKERS EMPLOYED AT SOME TIME DURING 1948-1951, SHOWING PERSON YEARS LIVED AND DEATHS AT AGES 15-64 DURING THE PERIOD 1948-JUNE 1963 THREE ASBESTOS PRODUCTS INDUSTRIES PERSON YEARS 'ASBESTOS LUNG CANCER" NO. OF DEATHS RATE PER 100, 000 ASBESTOSIS NO. OF DEATHS RATE PER 100, 000 BUILDING PRODUCTS FRICTION MATERIALS 171, 199 99, 604 TEXTILE PRODUCTS 24, 415 15 8. 8 10 10. 0 7 28. 6 19 11. 1 23 23. 1 16 65. 5 53.