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12 Cards in this Set
- Front
- Back
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What is ratio?
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a:b
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What is a proportion?
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a/a+b Numerator is in the denominator. Value ranges from 1 to 0. time usually specified but not necessary
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What is rate?
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a/a+b per unit time. Measure of change in num per unit denom. Freq of event
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What are measures of morbidity?
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Incidence(Cumulative incidence &incidence rate) & Prevalence (Point & period prevalence)
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What are measures of mortality?
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Crude, specific, case fatality rate
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What is incidence?
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The # of NEW cases of disease that occur during a SPECIFIED PERIOD of time in a POP at risk. Measure of risk. (#new cases/# people @ risk)
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What is prevalence?
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The proportion of affected persons in a pop @ a specified time. *includes NEW & OLD cases. Measure of burden not risk. (# people w/ disease in pop @ specifi time/ # people in pop @ specific time)
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What is cumulative incidence?
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Calc using a period of time during which all individ considered @ risk are followed for outcome. Proportion that range 0-1
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What is incidence rate?
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Denominator is sum of the diff times an individ is @ risk. (New cases/ person time @ risk)
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How is prevalence expressed?
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% per 1000, etc
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What are the 2 ypes of prevalence?
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Point (prevalenve @ a point in time-most common) & Period (prevalence for a period of time)
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What is the relationship b/w incidence & prevalence?
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prevalence= incidence x duration (influenced by recovery, death, migration)
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