Average Annual Age-adjusted Incidence Rates Research Articles

Breast cancer and religion in greater Bombay women: an epidemiological study of 2130 women over a 9-year period.

The resident female population of Greater Bombay consists of women professing different religious faiths, between which the frequency of breast cancer varies to a great extent. During the 9-year period 1964 to 1972 inclusive, a total of 2130 women with breast cancer were seen, with break-down by religion as follows: Hindus (1259), Muslims (306), Christians (264), Parsi (Zoroastrians) (226), Jains (25), Buddhists (26) and others (24). The average annual age-adjusted (world population) incidence rates, however, were found to be 48.5 and 18.2 per 100,000 in the Parsis and non-Parsis respectively, with an average of 19.9 per 100,000 for the total population. For reasons not yet clear, in every age group the incidence rate in Parsis was 2 to 3 times higher than in the non-Parsis. Time-trend analyses of our data do not reveal any statistically significant increase or decrease in the incidence of breast cancer in any particular age group. Data from death certificates for the same 9-year period show that the age-adjusted mortality rate (world population) is 9.2 per 100,000/year.

Factors related to the incidence of stomach cancer in the Pittsburgh Standard Metropolitan Statistical Area.

This report presents an analysis of several demographic discriminants of stomach cancer incidence for residents of the Pittsburgh Standard Metropolitan Statistical Area (SMSA) with the use of data collected as part of the Third National Cancer Survey, 1969-71. The Pittsburgh SMSA, one of nine areas included in the Third National Cancer Survey, was of particular interest in the study of stomach cancer, since area residents showed the highest age-adjusted incidence rate for cancer of this site while showing the fifth highest rate for all sites. To examine the data in greater detail, we used the variables of sex, race, nativity, and median income level to classify the cancer patients into homogeneous subgroups of census tracts of residence to allow comparisons of the average annual age-adjusted incidence rates among the groups. The data indicated that Pittsburgh SMSA residents showed stomach cancer incidence patterns that were generally consistent with earlier published reports; particularly when contrasted with appropriate population subgroups, higher rates appeared for males, for blacks, for lower income areas, and for areas with "large" proportions of foreign-born and foreign-stock residents. Furthermore, when one considered interactions among the factors, the relationship between ethnic composition and incidence appeared to supercede that of income among white males.