SAQ. Make a comparison between case control & cohort studies
| Case control study |
Cohort study |
- Proceeds from effect to cause
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- Proceeds from cause to effect
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- Starts with healthy people
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- Tests whether the suspected cause occurs more frequently in those with disease than those without disease.
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- Tests whether disease occurs more frequently in those exposed or in those not exposed.
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- Usually the first approach for testing the hypothesis.
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- Reserved for testing of precisely formulated hypotheses.
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- Involves fewer no of subjects
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- Involves larger no of subjects
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- Suitable for study of rare diseases
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- Inappropriate for rare diseases
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- Yields relatively quick results
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- Cannot yield info about diseases other than that selected for study
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- Can yield information about more than one disease
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