Difference
between case control & cohort study:
Case
Control study
|
Cohort
study
|
(1)Proceeds
from effect to cause.
|
(1)
Proceeds from cause to cause.
|
(2)Starts
with the disease.
|
(2)Start
with people exposed risk factors.
|
( 3) Usually the first approach to the testing of a hypothesis.
|
( 3) Reserve for testing of precisely formulated hypothesis.
|
(4)Involves
fewer numbers of subjects.
|
(4)
Involves large number of subject.
|
(5)Yields
relatively quick results.
|
(5)
Involving delayed results.
|
(6)
Suitable for the study of rare disease.
|
(6)Inappropriate
when the disease is rare.
|
(7)
Only estimates relative risk.
|
(7)
Yields incidence rates.
|
(8)
Can’t yield information about more disease other than that selected for
study.
|
(8)
Can yield information about more than one disease outcome.
|
(9)
Relatively inexpensive.
|
(9)
Relatively expensive.
|
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