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Case-Control studies represent one form of analytic study that
provides information on the relationship between causal factors
and injuries. In a case-control study, subjects who have been
injured are identified and their past exposure to suspected
causal factors is compared with that of controls (persons who
have not been injured).
Many case-control studies ascertain exposure from personal
recall, using either a self administered questionnaire or an
interview. The validity of such information will depend in part
on the subject matter. People may be able to remember recent
events quite well. On the other hand, long term recall is
generally less reliable.
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