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Data Analysis (Cumulative Incidence (This measure the proportion of people…
Data Analysis
Prevalence
This measure the number of people in a population at risk, who have the exposure at a given point in time (current/existing case).
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- Prevalence is a proportion
Incidence
This measures the number of people in a population at risk, who developed the disease over a given period of time (new cases)
- How many people develop a disease/condition every week, month, etc.
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Period Prevalence
This is prevalence measured over a period of time, such as a week, month, etc.
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Cumulative Incidence
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- This estimates the risk of becoming diseased in the time period
- The numerator and the denominator both exclude people with existing illness
- This is expressed as “cases per ‘10n’ people/population” (can be %)
- The denominator is the number of ‘persons at risk’
- The numerator is the number of new cases
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Incidence Rate
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- Incidence rate has a time component, and is NOT measured as a percentage
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- Numerator is the same as cumulative incidence (new cases)
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- However, the denominator is person-time