The population of the U.S. was 231,534,000 in 1989. The morbidity rate of tuberculosis in 1982 in the U.S. was 11 per 100,000 per year. Then multiply by 100,000 to arrive at 11 cases per 100,000. Then multiply by 100,000 to determine the mortality rate per 100,000. Case-fatality rate describes the lethality of the disease.
Attack rate is used in outbreaks where disease rapidly follows exposure.
Before we can initiate preventive strategies, it is important to determine which specific exposures or risk factors are associated with specific diseases and which protective factors are associated with health. Relative Risk Relative risk estimates the extent of the association between an exposure and a disease. It estimates the likelihood of developing the disease in the exposed group as compared to the nonexposed group. Therefore the data do not provide evidence for an association. This risk increases in strength as the magnitude of the relative risk increases.