Researchers Are Evaluating a Diagnostic Test for Legionella Infection That

question 164

Multiple Choice

Researchers are evaluating a diagnostic test for Legionella infection that relies on detection of bacterial antigens in the serum.  The test is compared to bacterial cultures, which are the gold standard for diagnosis.  A sample of 200 patients is selected.  Among 100 patients with culture-positive infection, the antigen test was positive in 90 patients.  Among 100 patients with negative cultures, the test was positive in 30 patients.  What was the positive predictive value of the new serum antigen test in this sample?

• A)30%
• B)70%
• C)75%
• D)88%
• E)90%

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Definitions:

Labor Productivity

The measure of economic performance calculated by dividing the output by the number of labor hours used to produce it.

Technological Advance

The process of developing and applying new techniques and tools to improve efficiency, productivity, or quality in various fields.

Input Proportions

The ratio of one type of input to another type of input used in the production of goods or services.