Lec4Morbidity(Revised07)

Lec4Morbidity(Revised07) - Measures of Morbidity...

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Measures of Morbidity
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www.cdc.gov/mmwr Morbidity and Mortality Weekly Reports
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Terms Related to Morbidity Morbidity The extent of illness, injury or disability in a defined population Incidence of a disease (Incidence rate) The number of new cases of a disease that occur during a specified time period (numerator) in a population at risk for developing the disease (denominator) Prevalence of a disease (Prevalence rate) The number of total cases of disease present at a particular time (numerator) in a specific population (denominator) Risk The likelihood that an individual will contract a disease
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Characteristics RISK PREVALENCE INCIDENCE RATE Probability of disease % of pop. with the disease Rapidity of disease occurrence No units No units Cases per person-time Newly diagnosed Existing Newly diagnosed “Cumulative incidence” “Incidence density”
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Who has the disease? Who to include in numerator?
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Lec4Morbidity(Revised07) - Measures of Morbidity...

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