POPM 3240 Lecture Notes - Lecture 29: Foodborne Illness, Case Fatality Rate

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The steady state is the balance between new cases and death/cure. General relationship in a steady-state situation (rates are stable and in-migration = out- migration) If we only know the prevalence of two population and one is higher than the other we still cannot say that one has a higher incidence because we do not know the duration of disease. May have low incidence every year but survive for a long time, may have high incidence every year but only survive for a short time. The later would have a lower prevalence but higher incidence. When insulin was discovered, the prevalence increased, incidence is the same. Because people are able to live with diabetes longer than before. Chronic disease: prevalence > incidence (people are living with the disease for a long time) Crude (overall) morbidity risk or rate any cause. Cause-specific morbidity risk or rate from a specific cause. Crude mortality risk or rate any cause.

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