| 3
Important Types of Rates |
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| # of new cases of a disease |
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| in a
certain time period |
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| Incidence
rate = |
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| Population at risk |
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| in same
time period |
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| # of new and old cases of a disease |
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| in a
certain time period |
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| Prevalence
rate = |
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| Population at risk |
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| in same
time period |
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| # of
new cases in a narrowly defined |
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| population during a specific time period |
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| Attack rate = |
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| Population at risk |
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| in same
time period |
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