The purpose of this study 給 the analys お of reg ね nal dif 麁rences of the trend in the age − and sex − specific mortahty rates ofcancers of the colon and the rectum by age group and by year, regression analysiS between year and the mortahty rates of cancers of the colon and the rectum , and cohort analyses by every 丘ve years birth cohort . The mortality rate of colon cancer tends to be increasing in higher age classes in both sexes 加 . aH Japan . The cohort analys 治 by every 丘ve years birth

more »

... t shows tha もthe mortality rate ofcolon cancer tends to increase f { )r those over 35 years of age and both in later years in both sexes except in ・ few areas . A difi7erence was found in morta 丘ty rate of coion cancer among those in th 曲 rties and the 脆 es of age depe 岫 on the 肛 eas . Judging 丘om the resUlt of this study , it ls forecasted that t】 be fUture mortality rate of colon cancer w 皿 increase in ma 】 es of KantD and Kinki areas in their 丘冠 ies of age , in fema】 es of Tbhoku, Tbkai and Kinki areas in their fift ; ies of age . The speed of increase of mortality rate of rectal cance 葛 compared With that of colon cancer