Epidemiologists Decided to Investigate the Validity of New Diagnostic Tool

question 1

Multiple Choice

Epidemiologists decided to investigate the validity of new diagnostic tool for breast cancer.They used this new diagnostic tool for breast cancer in 150 women with biopsy-proven breast cancer in 300 age- and race-matched control women.The results of the new tool were positive in 136 cases and in 35 control women,all of whom showed no evidence of cancer at biopsy.Now,the epidemiologists want to use the new diagnostic tool for screening program in Cities A and B.Based on previous cross-sectional studies,the prevalence of breast cancer is 5% in City A and 1% in City B.What is the expected positive predictive value of new diagnosis tool for breast cancer in City A?

• A) 30%
• B) 43%
• C) 81%
• D) 89%
• E) 91%

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Definitions:

Deficit

An economic condition where expenditures exceed revenue.

Balance of Trade

The difference between a country's exports and imports of goods.

Imports

Goods or services brought into one country from another for sale or use.