Document ZBkLLoV07LmazkneyKjwekw2J

U'SC CAXCEJt /.V ASBESTOS XtXEXS TaIIX Distribution of Admit Mott* fo* Tmu 20--/tnmal Orel* flair* ftr IK`J'00 tk* rrotintt of Qntbftt 1951 * Cancer of fkr Lmmg w Canada * An fii9 Nusacf hRMUtt * C6*n * RlffOft, tM. a miner of the same intensity of interest as it is in younger persons. Table 18 also answers a question pre viously raised. It shows that the members of the cohort have not died from lung can cer at an age earlier than the general popu lation, and that such an explanation cannot be offered ior the absence of lung cancer in 240 men with more than 40 years of employment referred to on page 6*3. Before leaving this comparison of the Province with the miners, it should be shown that their age distributions are rea sonably the same. That this is the case can be observed from Table 19. It should be remembered that die miners retire and consequently, it can be expected that the oldest age group will be larger in the general population. The data presented m Table 20 indicate that the lung cancer rate generally decreases after age 70. There fore, we could expect the rate for all people over 63 to be smaller than the rate for the group between 65 and 75, which would apply to the oldest group of miners. It is felt that by using the whole adult male popula tion. we have developed rates for the gen eral population which are somewhat lower than if we had been able to exclude the people in the general population over 75. A comparison between the asbestos miners and the population of the Dominion as a whole was made, using statistical material from several sources, in one source, Phil lips gave age- and sex-specific rates for Canada for three periods between 1931 and 1952. The rates for males are given in Table 20. These figures show strikingly the increase in rates between 1931 and 1932. and this Uw> M ' SMS au am 03 OS u> VI u tlS . 11A 1X1 ta.7 tu j l. tl OMNMrroa mw*u 04 0.0 VI u as 14J DA SJ MS 30* MS VS MS u ItiO-ll IS 4 is u iii J2J m.; TU a TIjO tu "MmslM; lm Lotts Csactr at C*wda.~ Its* I* IttL facrcass is particularly marked after age 50. confirming an observation previously made, to the effect that until recently lung canctr hat probably been underdiagnosed in the ohJer age groups in the general popu lation. To use these figures for purposes of comparison, it is necessary to combine the rates for certain age groups in order to conform to the age distributions used in this Study. Since the exact populations in each age group for the years indicated is not known, this must be an approximation. However, the rates would be somewhat as follows: A|< C^*l IO-M JV4 ts+ fca* f 31 t 0401 These rates are, in general, lower than those developed for the total fproved and suspected) cases of lung cancer among the asbestos miners. The only large difference, however, is in the age group of 65 years and over, and it is quite possible that the rate for this group may bare increased for Canada between 1952 and 1954 as it did for the Province of Quebec t'Table 17). A further comparison has been made with an over-all rale obtained from the American Cancer Society for respiratory cancer deaths in Canada in 1955. This rate, for males, is 20.S per 100,000. or 5 more per 100.CO0 than Phillips' 1950-1952 rate, and compares with 25.5 pe. IC2.C0C '%h proved cases and 338 per 100.000 for total cases among the W