Case Control & Cohort Study Differences
Case Control Studies 公卫百科 | Cohort Study
公卫考场 | |
Advantages
公卫百科 | They are quicker and inexpensive to conduct 公卫家园 | It can measure the incidence of disease,so it can tmeasure RR 公卫人 |
They are good for rare diseases 公卫考场 | It good for rare exposures
公卫家园 | |
The sample size is smaller than cohort study 公卫考场 | It is prospective and permits multiple outcomes to be assessed in the same study 公卫考场 | |
They are good for new serious diseases to explore the possible causes 公卫论坛 | The temporal sequence is appropriate,so it good for causal association inference
公卫考场 | |
Disadvantages 公卫人 | They are retrospective,temporal sequence may be a problem,so it is difficult to establish the association between exposure and diseases 公卫考场 | It requires large sample sizes and need long follow-up periods 公卫人 |
There are some potential biases,such as selection bias,recall bias 公卫考场 | It is very expensive 公卫论坛 | |
They can not measure the incidence of disease,therefore can not measure RR
公卫百科 | It is inefficient for rare diseases
公卫论坛 | |
They are iefficient for rare exposures 公卫百科 | Some biases:loss to follow-up bias,measurement bias
公卫家园 |
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