Document 06r4oegNNaZNBKOVV9m3Mpzjm

........................................................... 4.9,. . was carried put Ip order to determine aa nearly as pooilble tho exact cause of death. Mortality rates from lung cancer for the gonoral population af the Provide* of Quebec and Us various counties and for tha Dominion of Canada, as tvoll as the United Statos were calculated from statistics collected In the appropriate places, Comparisons of the rates obtained for asbestos workers and far the other population groups were msdo according to accapted statistical Records were obtainod on 6091'parsons who fulfilled the criteria of the cohort. It was not posolble to trace 133 of theso for the whole period, bnt 5771 of the remaining 5956 were found to bo stUl living In 1955 or lator. Of the 187 known doad, cancer of tho lung was coneldered to have been roasonably proved In nine and to bo strongly suggested In throe. The members of the cohottwere studied with respect to age, length ot employment, a weighted average of thelT exposure, and tholr smoking habits, Pour thousand, six hundred and seventy-throe were found to be smokers within the definition af that term as used In this'study." Thirty-four per.coat of the cohort were more than 45 y'caire of ago, had 30% had been employed for longer than 20 yeare. Thirty per cent- had awolghtod exposure which placed them (^category of highest oxposuro. The mortality rate'for lung cancer, as computed on the basis of nine "proved" deaths among tho cohort was 25,3 per 100,000. When the three "SuspocUd" cases were added, tho "total" rate for tho cohort rose to 33,8. 0299