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<v ->Hi all, and welcome to module six.</v>

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In this module, we will continue our discussion

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of Threats to Internal Validity.

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We're going to start talking about confounding,

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which is one of my favorite parts

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of EPI methods to think about.

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This is the first three modules

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in which we'll discuss confounding,

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getting increasingly complex as we go.

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You might remember back to your discussion

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of confounding an EPI one,

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where you talked about how we're able to control or adjust

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for confounding in the analysis phase of an EPI study.

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In EPI one, we talked about adjusting

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and controlling for confounding in terms of stratification.

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However, there are more advanced methods

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involving linear regression

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that we're going to talk about starting in the next module.

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Make sure that you're feeling really comfortable

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and solid with the information this week

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because we're going to be building on it

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for the next few weeks.

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So if you have questions

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about what it means to be a confounder

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or some of the basics of adjusting,

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please reach out to me

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before we move on to regression in the next module.