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Old 12-15-2009
Hunter Hunter is offline
 
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Default The Correct Answer

The correct answer C.
Your control group should have the risk factor (lack of breast feeding) unknown. Then your study should find out whether it's really the lack of risk that have prevented the development of atopy (disease) or it's something else like lack of family history, or gestational age, or drug history, ...etc by comparing them to your case group (disease + risk factor).
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DrLANC (12-15-2009)