A Large Study Evaluated a Rapid Toxin-Based Stool Assay for Diagnosing

question 425

Multiple Choice

A large study evaluated a rapid toxin-based stool assay for diagnosing Clostridium difficile colitis.  It evaluated the test against polymerase chain reaction, which served as the gold standard.  The following values of the new test were obtained from a hospitalized symptomatic patient population with 50% prevalence of Clostridium difficile colitis: Which of the following is the positive likelihood ratio for the new test?

• A)0)2
• B)2
• C)5
• D)6

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Definitions:

Disc Brakes

A type of brake system where brake pads apply pressure to a disc or rotor attached to the wheel, slowing or stopping the vehicle.

Drum Brakes

A type of brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a drum.

Brake Fade

The reduction in braking power that occurs after repeated or sustained use, often due to overheating of the brake components.

Hydraulic

Relating to a system operated by the motion and pressure of fluids, used in various applications including machinery and vehicle brakes.