Geographic differentials in mortality and life expectancy in the region surrounding Montreal, Canada, are compared.  The author notes that "despite a marked drop of mortality in the Montreal region, there are still important geographic disparities at the end of the [1980s]....A multiple regression analysis shows that the proportion of poor and the percentage of immigrants account for more than 80% in the geographic disparities of life expectancy in the Montreal region." (SUMMARY IN ENG AND SPA)