Document oe72yXr8wg0843YX8XV952vnE

..................................................... 49............................ u carried out la order to. determinen nearly at passible the exact-caute of doalb. MorUUty rates fromlung ceocor for the ganoral population of the Province of Quebec and Its various counties and for tho Dominion of Canada, as tvoll as the United States wore calculated from statistics collected In the appropriate places. Comparisons of tho rates obtained for asbestos workers and for the other population groups .were mado according to accepted statistical .irpl.tr. ^ In ............... * Records waro obtained on 6091-persons who fulfilled the criteria of - the cohort. It was not posotble to trace 133 of tbeso for the whole period, bat 5771 of the remaining '5958 were found to bo still living In 1955 or lator. Of tbe 187 known doad, cone or of tbo lung was consldsred to have.been reason ably proved In nine and to bo strongly suggested In throe, Tba members of tbs cohort'we'r# studied with reepoct to age, length of employment, a weighted average of their exposure, and tbolr smoking habits, Pour thousand, six hundred and sevonty-three were found to bo smokere within tba definition of that term as usod In this'study," Thirty-four per.cont of tbe cohort were more than 45 years of ago,' hnd 30% bad been employed for longer than 10 yoaro. Thirty per coot had a wolghtod exposure which placed them la category of highest exposure. A The mortality rate for lung cancer, as computod on tho basis of nine "proved" deaths among tho cohort was 15.3 per 100,000, Y/hen tbe three "uspectad" cases wsre addad, tbo "total" rale for tbe cohort rose to 33.8. 0299 ;