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Public health science USMLE step 1 Practice Questions and Answers
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Public health science USMLE step 1 Practice Questions and Answers What number is in the denominator for the RATE of divorce? - Answer️️ -Per 100 marriages What number is in the denominator for the RATE of infant mortality? - Answer️️ -Per 1000 live births What is the typical RATE give...

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  • August 28, 2024
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  • 2024/2025
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  • public health science usmle step 1 practice questi

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©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM


Public health science USMLE step 1
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 epidemiology for most cases? -
Answer✔️✔️-Per 100,000.

What are most disease rates in the US for most all diseases? - Answer✔️✔️-
Less than 50 per 100,000.... Almost ALL are below 100 per 100,000

What is an INCIDENCE rate? - Answer✔️✔️-The rate of NEW cases in a
population divided by people at risk to be a case

What is a PREVALENCE rate? - Answer✔️✔️-The rate of ALL cases in a
population divided by people at risk to be a case.

How do you remember was an incidence rate is? - Answer✔️✔️-IN-cidence
is the rate of new IN-coming cases

What type of rates should be associated with Incidence? - Answer✔️✔️-
Attack rate---you shrink the denominator as per the exposure.




1

, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

Create a difference 'attack rate' for every food that was eaten in a
restaurant, saw, and the one with the highest rate is the culprit. (Acute
conditions)

What two prevalences are associated with prevalence rate? - Answer✔️✔️-
Point and Period prevalence

What is point prevalence? - Answer✔️✔️-A particular INSTANCE in
time....Who has the disease over who is at risk.

What is period prevalence? - Answer✔️✔️-Period is for a larger period of
time, who has it over this period over who is at risk

Mortality data is by definition what type of date? - Answer✔️✔️-Incidence
data....the number of newly dead

What is the general relationship between prevalence and incidence? -
Answer✔️✔️-Prevalence = incidence x duration....

If either incidence or duration increase, so does prevalence.

What is a CRUDE rate? - Answer✔️✔️-A rate that is generalized to an entire
population, ie death rate in the US in 2000

What is a SPECIFIC rate? - Answer✔️✔️-One that has been modified to have
some sort of qualifier, ie male death rate in 2000... This is GENDER
SPECIFIC




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, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

What is a CASE fatality rate? - Answer✔️✔️-The number of deaths from a
specific cause (heart disease) divided by the number of patients with that
disease.

What is the Proportionate mortality rate? - Answer✔️✔️-Deaths from a cause
(heart disease) divided by all deaths.

Sensitivity detects what?? - Answer✔️✔️-DISEASE! The calculation deals
with diseased people. They actually HAVE the disease.... So it is true
positives divided by the rest, True positives over (TP and the false
negatives)

Specificity detects what?? - Answer✔️✔️-HEALTHY people!! True negatives
over all people without the disease (TN+ FP)

What does PPV detect? - Answer✔️✔️-The value of a positive test result and
of course is given by the TRUE's divided by everything in the row. True
positives divided by all positives, TP AND FP

What does NPV detect - Answer✔️✔️-The value of a negative test result,
given by the TRUE negatives divided by all the negatigves, TN and FN

How do you calculate the ACCURACY of a test? - Answer✔️✔️-TP + TN
over EVERYTHING, TP FP TN and FN

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.




3

, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

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?

What type of study design is this?

How would you analyze data from this study?


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