Question: A Case Control-study Was Conducted To Examine The Different Risk Factors (e.g. Family History, Alcohol Use, Obesity, Diet, Ethnicity, Smoking, Herbicides And Solvents Exposure, Etc.) Associated With Breast Cancer Among Women. Investigators Recruited Cases Of Breast Cancer In Several Hospitals In The New York City. Controls Were Selected In The Same ...

A case control-study was conducted to examine the different riskfactors (e.g. family history, alcohol use, obesity, diet,ethnicity, smoking, herbicides and solvents exposure, etc.)associated with breast cancer among women. Investigators recruitedcases of breast cancer in several hospitals in the New York City.Controls were selected in the same hospitals as the cases. Controlsincluded women diagnosed for other conditions or diseases thancancer. (1.1 point)

a. What is the main purpose of a control groupin a case-control study? (0.3 point)

b. What are the advantages and disadvantages ofselecting a hospital-based control group? (0.4point)

c. The investigators decided to match the casesand controls for education. Explain the reasons behind thisdecision in this particular study.

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Question: A Physical Examination Was Used To Screen For Breast Cancer In 1,500 Women With Biopsy-proven Adenocarcinoma Of The Breast And In 3,000 Age- And Race-matched Control Women. The Results Of The Physical Examination Were Positive (i.e., A Mass Was Palpated) In 1235 Cases And In 450 Control Women, All Of Whom Showed No Evidence Of Cancer At Biopsy. The …
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