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because the same group of people are followed over time.
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You'll see longitudinal studies, cross-sectional studies
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mixed in to the sort of papers that I'm having you read.
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It's interesting for you to think about
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what you--what it means when it-- in the abstract of a paper it says,
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this is a longitudinal cohort study versus a cross-sectional study.
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Here's an example. Let's take a study and interpret this.
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2006 there was a paper published
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in The Journal of the American Medical Association
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looking at green tea consumption,
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the mortality due to cardiovascular disease
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in a Japanese sample of individuals.