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What is the use of matching in case control studies?
- To control Confounding- the effect or association between an exposure and outcome is distorted by the presence of another variable.
- By selecting variable that could be confounders (e.g race, gender, smoking status, age), cases and controls are then selected based on the matching variables such that both groups have a similar distribution
What is cholelithiasis?
Formation of gallstones
Describe the presentation and cause of a gallstone ileus.
- Presentation: Abdominal pain, abdominal distention, Vomiting, X-ray reveals air in the gallbladder and billiary tree.
- Cause: Passage of gallstone through a fistula between the gallbladder and duodenum, where it ultimately causes obstruction at the ileocecal valve.