Public health science USMLE step 1 Exam Practice Questions and Answers
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Course
USMLE
Institution
USMLE
Public health science USMLE step 1 Exam
Practice Questions and Answers
What number is in the denominator for the RATE of divorce? - ANSWER-Per 100 marriages
What number is in the denominator for the RATE of infant mortality? - ANSWER-Per 1000 live births
What is the typical RATE given in epidem...
As prevalence increases what happens to positive and negative predictive values? - ANSWER✔✔-PPV
goes up. More people have the disease, thus a + test result is more believable.
NPV goes down. More people have the disease, fewer people are without it so a negative is less likely.
There are NO direct changes on a screening test based on increased or decreased incidence.... -
ANSWER✔✔-Dur.
What is the relationship between pretest probabilities of sensitivity and sensitivity WRT prevalence? -
ANSWER✔✔-NONE...Pretest values are constant and are a measure of the test itself, and will never
change.
What point of the double hump diagram gives you the FEWEST FALSES or the highest accuracy for a test?
- ANSWER✔✔-The point where the two curves cross...To move either direction gives you a few fewer
falses in one category but a whole bunch more falses in another direction.
What is the FIRST thing you need to do when constructing a 2x2 table for the USMLE? - ANSWER✔✔-Pick
a total population number and anchor is with PREVALENCE before plugging in numbers. Prevalence is the
number of people in the population with disease, so for 100 people and prevalence of 20 % is 20 with
disease 80 without....Then plug in the corresponding Sensitivities and Specificities.
What are the four study design questions asked on USMLE questions? - ANSWER✔✔-What type of bias is
there, if any?
How would you fix the bias, if any?
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