Document V37xvGkd13xawkgrL1Gmd5x4

.41 These figures show strikingly the Increase In rates between 1951 and 1952, sad this Increase Is particularly marked aftor age 50, confirm* |*| an observation previously tnado, to the effect that until receutly lung cancer has probably been under-diagnosed In the older age groups In the general population. To use thooe figures for purpoaoo of comparison, U Is necessary is 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 (or the years Indicated Is not known, this must be an approximation. However, Its rates would be somewhat ss followst Ajje Orou__ 20*44 45-54 55-64 65 Rato 5 27 69 90-95 These rates are, Infgeneral, lower than those developed for the total (proved and suspected) cases of lung cancer among the asbestos miners. The only large difference, however, Is In tho age group of 65 years and over, tad It Is quite possible that the rate for thlo group may have Increaoed for Canada between 1952 and 1954 as It did for the Province of Quebec. (See Table >4.)^ 0231