vault backup: 2024-09-11 13:21:04
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## Types of Studies
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### Experimental
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- A *systematic way* of testing a hypothesis
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- A *systematic way* of testing a hypothesis.
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- Animal vs human
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- Treatment vs control
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- There's a degree of *control* present.
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- Can be used to test causation.
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### Epidemiological
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- An observational stu of the occurrence, distribution, and associations between factors and health or disease in a population.
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- *Observations* of the occurrence, distribution, and associations between factors and health or disease in a population.
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- Observations at one point or over time.
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- **Case Control:**
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- Cases matched with controls and information is gathered
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- **Cohort** (2 types):
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- Retrospective: Collect info about a group's past exposures and identify current outcomes
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- Prospective: group of healthy people that are followed over time and the outcome noted.
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- Most common for use on humans.
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- **Never** used to determine *causation*, only correlation.
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- Human experimental studies are usually **double blind**, meaning neither the investigators nor the subjects are aware of the group assignment.
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# Definitions
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| Term | Description |
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| -------------- | ------------------------------------------------------------------------------------------ |
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| Nutrient-dense | Nutrient-dense food supplies more vitamins and minerals in relation to the total calories. |
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| In vivo | Experiments using entire living organisms |
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| In vitro | Experiments on cells and other components. |
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