Document xjYgmaeyyVYYgv71JyrKz8nM6

IV,\'G CAXCEK JX Asunsros MtXEKS fABtE 15.--.VumfcAr <md Pereemlone Pittributum of Smoktrs and Ximsmokers by Exposure Catwry Xmubtr Bmokrn Nutmuakm I4 191 i.m 4 Cl 433 V** 1 4,6X3 IjU SjO IS Coliwim 4 7 It M 91 21 Demography in the Provincial Ministry of I leallli,. The data on total ileaths, deaths from all forms of cancer, ami dcallts from enneer of the lung were obtained lv sex and by county for the years 1930 througfi 1955. In addition, ah death evrtilienlc.s which :.|Kvi(icd primary ctmcer.of the lung, and all those which indicated lung cattcer but did not specify the origin, were exam ined for the years 1952 through 1935. fmtmatt nuulliUlluo Table 16 gives a tabulation of the numlicr tmk . Bouton i .h::: IU.................... Ciknn.................. i nj atuu 94 MOft Nommriw ST4 13.7 SU 9.1 U0% Vakaevn USu. OS 190% of deaths from lung cancer in the Province and ill the cohort for the years 1950 through 1955, and shows the annual rate (icr 100,(X)0 in these segments. It will be noted from the table that the mortality rate for the "proveil" cases in the cohort is only slightly larp.'r Vrnied, the smokers had wurked almut 2.3 tly, ad- Sears less on the average tlian the non* ve con- 'jnokers. With longer exposure aiul greater raokert jige, one would cx{>ect the nonsmoking employ- "1roup to show a higher rate if lung cancer tthough Isrre due to asbestos. Table 13 shows that do not Jiie average exposure category was almost d cases She same for the two groups. Therefore, respect "his variable scents to be of no imimrtancc average -in accounting for this difference. Lss than show, b con Thc result of this additional analysis is it nour of these factors aiqwars to lessen Ahe effect of Tabic 12. :<1 Comparison of the Cohort Experience tribution rt* Ithat of the Province of Quebec. Do- *fainio of Canada, and the (:nil>d Stales.-- higher than the rate for the Province. When the "susjiected" cases arc inehulcd in Ihe calculation, the ralr for the cohort rises to .1.5.8 |kt HXI.OUU, which is about 50% higher tlian the.rate for the Province. This, it will be recalled from the previous dis cussion of the effect of the 'Suspected'" cases on the results, approaches but docs not exceed the significant level. One further interesting observation from Table 16 is the rather marked increase in the liit.it mnulwr of cases for the Province between 1950 and 1955. It is assumed that at least |rt of this increase is due lo im proved recognition and rv|Nirting of lung cancer during tile interval. l;or this reason, ](n order to make a cniu[eiri.-nn of the the years 105-4 ami l'55 were thought to be ikaavo tt 4 9 4 30 experience among asbestos miners with that ^f the general population of the Province of ^Quebec, statistics were gathered, as statctl 'jarfier. in the office of the Division of more nearly rejiresetnative of actual condi tions. F.vcti so, it is quite likely that the general imputation is not studied for lung cancer with the suite diligence with which Tabu 16.--Comporiseu of Cohort frith Province of Quebec U4 IsOngCaacrf Oralhi Annual fcoovo J9fcJ4O0 0Oj9O -% Jtoawts iwn 1161 1933 iwa rt*4 !33 Total lOMUO .Vfiortw* fTUml i.raAoo* vm t tva 2 39 3 1U e so 4 303 1 IS I'ttt 3 13 4 ftotid . Wl*r 1 3 0 3 I J9 J.lttiUO 193 1U 343 30) 303 334 1.813 itetttdlos Mbcstoy urUni 3LA 334 XL) 84 " *1 |ii|lw Pimvtiw* iburrs It Im Imn Mwnaai utl maV hutff cbixw Jaolhifar nwi afsnf yajn, ApKoaltTM6tomM|i!nlufl1i*imjaeminl||rtitetlun|urlii&|,tfnilttietUnKMr(t |>itbifcsa fur IKrl tltuppifl, iMr. d b I>. ' (Sumbtr *IIm In cutm at taytn&lnf of 1033. % J95* vtrjun--Truan t -