mjl1717
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What is a case control study??What are the advantages and dis- advantages of this type of study??(If possible what is another name for this type of study?)
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| phuluong2k
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Case control is an retrospective study
At the moment of study we have 2 groups
Case = Disease
Control = Without disease
And we look back in the past to search for the risk factors that may cause the disease and compare them in the two groups
It is opposite to the cohort study which is prospective
One groups with the risk factor such as smoking
Another is without smoking
At the moment of study, both of two groups have no disease as cancer
And we observe the incidence the difference of cancer incidences of 2 groups later.
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| mjl1717
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You got it:
Advantages of case control:
cheap, quick , few subjects, may show multiple potentila cause of a ds.
Disadvantages:
bias may come in to play since they have the ds, undiagnosed cases are missed, selecting the control may be difficult, they cannot prove cause effect relationship, "cannot determine rate, risk, incidence or prevalence"
*This is how the relation between DES/ clear cell CA of the vagina was discovered!
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