A 22-Year-Old Man Who Recently Immigrated to the United States

question 20

Multiple Choice

A 22-year-old man who recently immigrated to the United States comes to the physician for routine care.  He has no current symptoms.  He takes no medications and has no known allergies.  Laboratory testing yields the following results: The patient's country of origin does not offer universal immunization against hepatitis A, and he says he has not been vaccinated against the virus.  Which of the following do these laboratory findings most likely suggest?

• A)Anicteric viral infection as a toddler
• B)Asymptomatic viral carrier state
• C)Chronic viral hepatitis
• D)Immunity against hepatitis D infection
• E)Liver failure during childhood
• F)Occult cirrhosis
• G)Reinfection with hepatitis A virus
• H)Window period

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Definitions:

Dependent Variable

The variable in an experiment or model that is expected to change in response to changes in the independent variable.

Stepwise Regression

A method of fitting regression models in which the choice of predictive variables is carried out by an automatic procedure.

F-statistic

A ratio used in statistical analysis to determine the significance of a group of variables in a regression model.

F-to-enter

A criterion used in statistical analysis to decide when a variable should be added to a regression model based on the F-statistic value.