Strengths and Disadvantages of Cohort Studies
Prospective Cohort Studies
Strengths of Prospective Cohort Studies
- They can provide better quality of data on the primary exposure and also on confounding variables
- Since exposures are assessed before outcomes occur, they are less prone to bias.
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Disadvantages to Prospective Cohort Studies
- They are more expensive and time consuming.
- They are not efficient for diseases with long latency.
- Losses to follow up can bias the measure of association.
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Retrospective Cohort Studies
Strengths of Retrospective Cohort Studies
- They are useful for rare exposures, e.g., unusual occupational exposures
- They are cheaper and faster than prospective cohort studies
- They are more efficient for diseases with a long latency period
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Limitations of Retrospective Cohort Studies
- Exposure data may be inadequate and there may be inadequate data on confounding factors, such as smoking, alcohol consumption, exercise, other health problems, etc.; old records were not designed to be used for future studies
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