| Cohort Epidemiology |
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| • | Address
long-term exposure-response window |
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| • | Large
populations in multiple cities enrolled |
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| and
then followed for many years to determine |
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| mortality
experience |
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| • | Must
control for spatial confounders, e.g., |
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| smoking,
income, race, diet, occupation |
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| • | Assessment
of confounders at individual level is |
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| an
advantage over cross-sectional, “ecologic” |
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| studies |
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