Document RjaGBzVLDGK44k1zjvpY8m03k

1HEALTH, CAXiTiK IX ASHIiSTTOo:S MIXliHS 1 ante liar pcu,s`ons with the physicians in clvvrgc pulation' * *^e as^os,os sumpanics' programs ami ;es ith clinicians, pathologists, representatives .,,, if City ami Provincial health ilqiartiiicnts of this ` * 'c ^'ttttadiau tanevr Ninety, ami ttions ` ;rfu:r interested persons. It was (maul dial uij . 'turbidity data, although sontcwliat limitnl. ose who r*a' avi,'*a*'*,` tnnn such shims as the Pariion -T^l''111'* '* Montreal and Quebec City, ami s 5c U cancer detection centers in the Prov- (we. However, because of the high murg^occur' itity in lung cancer, it seemed advisable ' .`.j depend upon data relating to deaths. a -Aete we found to he otituiiuitite at the jicil statistics ijvjartwcnl ul the Minis)ry For ' i# Health in Queticc Gty. l-'nau the pcc^ U*"v`\innary survey, it was npicirvnr that exu-ii- ire and detailed information could be _____ y 'ithered with respect to both tlu* (ktsoiis at tuch 5VS^KS''4S uulustrv , . ji| the imirtalily figures for the general dan^yi,ublio,, figures d Following -this exploratory survey, the tniscntw Pl'a* `-`ffrt was directed to the collection ker* or -r ^ata re*at'nff (o tH workers w(io had ict the ^nl l,r0CC!WC^ through the clinic at Thet is gen- Mine* since its inception in 1947, and ion *bc p"'iar information rcganling all workers Asliestos, Quo. Data from tin- clinical irds Included the age, family and jier- il' medical histories, smoking habits, unber of jvars of cximsurc. an estimate weighted exposure, and the course of individual's health status or the cause 'll his death. estab- i From this ittfonuatioti' it was jmssiblc utes a J> fonnulale a "cohort" which could be well ion of Vlincd. should be representative of the for all group, and could be followed for a 'fleeted ' kftnitc period of time. All of the available g can- jspcriencc indicates that the development idera- If aslicstosis in less than five years of vxd will Josure must be somewhat rare. Accord- roach ly, the cohort was defined as including risons itry miner who had a total vxjiosure of or more years, and who was on the >urccs ofved J9.V iploymcnt rolls in 1950. Office and ulhcr texposed personnel, regardless of Iciiglb fl employment, were not includcil. This Iniun--Tnta* coliori was (licit fiillowctMiy means of the annual physical exaniination rcconls through a six-year interval, 1951) through 1955. All data regarding this group were then tabulated in order to dclcnuittc the characteristics of the cohort. I'or. those who snrvivctl the entire |vriud, reference w;ts nunU- In tlu- physical cxniuitialion results and x-ray findings at the end of the ]>criud. Those who had died were tabulated separatclv. and the cause of death was corroborated by cxatuinaiiuii of the death certificates.' A further search was marie concerning those ill the urigittal cohort who n-inaim-d uigu'coiujicil for when Ihc living and the known dead had been tabulated. They represent men who had left employ ment through retirement or resignation. Kventtially, all hut a snail nunilier of these wexe accounted foe as either living or dead, and in the latter event, (lie muse of death was substantiated in a similar manner, and the results added to the original list of deaths. __ Death certificates' far the Province of Quebec for the years 1952 to 1955, inclu sive. were reviewed in the department of vital statistics of the Provincial Health Ministry. together with statistical sum maries of the causes of deaths in the Prov ince by counties. All eases in which death was certified as having been due to pri mary cancer of the lung were examined for such information as |ilarc of residence, occupation, date of death, hospital in which death occurred, anil whether or not an autopsy was performed. Cases in which lung cancer was given as a cause of death, but in which it was not S|x-cificd as to whether the cancer originated fit the lung, were also reviewed in an effort to include all instances of primary carcinoma of the lung in the study. The statistics for the Province of Quebec relate to population, total deaths from all causes, total deaths from cancer of all types, and deaths 'from lung cancer. These were cnlh-civd and tabulated by cotiiilics and by sex for the years 1950 to 1955, inclusive. A)') I. i ( I ! I i: !i ri * b t \ j i