Essay
A study was performed to investigate disease relapses between two groups of Crohn's disease patients. All subjects entered the study with the disease under control. Suppose 18 patients in group A experienced relapses, and only 5 patients in group B experienced relapses. Why would it be incorrect to say that patients in group A have higher risks of relapse than those in group B? What information do we need to make a justified comparison?
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