A Group of Researchers Wants to Identify Factors Related to Hospital-Acquired

question 50

Multiple Choice

A group of researchers wants to identify factors related to hospital-acquired bacteremia caused by methicillin-resistant Staphylococcus aureus (MRSA) .  A total of 45 patients were enrolled in the study after MRSA was isolated from a blood sample taken from them on the third or subsequent day after admission.  In addition, 90 patients admitted to the hospital over the same period with a length of stay >2 days who did not have bacteremia were randomly selected.  The frequency of factors such as insertion of a central line or urinary catheter and surgical site infection were then compared between the 2 groups.  Which of the following is the most appropriate null hypothesis for this study?

• A)Hazard ratio is equal to 1
• B)Hazard ratio is not equal to 1
• C)Odds ratio is equal to 1
• D)Odds ratio is not equal to 1
• E)Relative risk is equal to 1
• F)Relative risk is not equal to 1

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Definitions:

Analytical Intelligence

The capacity to assess, critique, differentiate, and compare data.

Practical Intelligence

A type of intelligence related to the ability to solve everyday problems by utilizing knowledge gained from experience in contrast to theoretical or academic knowledge.

Intrapersonal

Relating to or within a person's own mind or self.

Interquartile Range

The difference between the 75th and 25th percentiles of a data set, representing the middle 50%.