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Hi, everyone, and welcome to Module 4

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on observational study design.

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In this module and the next two modules,

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we're going to be talking

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about the different types
of epidemiological studies.

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EPI studies are the way

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that we gather the data that we need

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in order to do public health research

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and in order to understand
how diseases are transmitting

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and spreading in different populations.

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We're starting off in this module

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with observational study design,

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but there are a number
of different designs

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that are all similar but
all a little bit different.

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I've included a Study Design Cheat Sheet

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in your learning materials
below, and hopefully,

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this will help you keep
them mentally straight.

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We're talking about cross-sectional

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and case control studies,

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among others, in this module,

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and these studies rely on
measures of prevalence.

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If you remember back to Module 2,

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prevalence is a measure
of existing disease

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or the burden of disease in
the community or population.

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In Module 5, we'll talk
about cohort studies

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and randomized controlled trials,

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which use incidents or
measures of new disease.

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So you can see that we're bringing in

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what we learned in Module 2

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to examine disease through
these different study designs.

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If you have any questions
about this material,

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please don't hesitate to let me know.

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Take care.