NBME CBSE: PUBLIC HEALTH SCIENCES PT. 1 EXAM
QUESTIONS AND CORRECT ANSWERS GRADED A+
(REAL EXAM)
What does a higher number in 1/ARR indicate?
Safer exposure.
What is 1/AR?
Case fatality rate: % of deaths occurring among those with disease.
How is case fatality rate calculated?
Deaths/cases * 100.
What is mortality rate?
# of deaths within a population within a defined period.
How is mortality rate calculated?
Deaths/total people.
What is attack rate?
Proportion of exposed people who become ill.
How is attack rate calculated?
,People who become ill/total people exposed.
What is demographic transition?
As a country proceeds to higher levels of development, birth and mortality rates decline to varying
degrees, changing the age composition of the population.
What are the characteristics of a growing population?
Short life expectancy, increasing mortality rate, increasing birth rate.
What are the characteristics of a stable population?
Long life expectancy, low mortality rate, low birth rate.
What are the characteristics of a declining population?
Long life expectancy, low mortality rate, really low birth rate.
What is likelihood ratio?
Probability of + result in patient with disorder/Probability of + result in patient without disorder =
sensitivity/1-specificity = TP rate/FP rate.
How is the likelihood ratio for a negative result calculated?
Probability of - result in patient with disorder/Probability of - result in patient without disorder = 1-
sensitivity/specificity = FN rate/TN rate.
, What is a Kaplan-Meier curve used for?
To display time-to-event data, often used to examine mortality.
What is survival probability?
1 - event probability.
What factors affect PPV and NPV in the evaluation of diagnostic tests?
Disease prevalence in the population being tested.
What is test efficiency?
(TP+TN)/(TP+FN+FP+TN).
What is a case series?
Description of clinical findings/symptoms for several patients with the same diagnosis, treatment, or
outcome.
What is a cross-sectional study?
Assesses the frequency of disease and risk-related factors in the present.
What is a case-control study?
Retrospectively compares a group of people with a disease to a group without the disease to
determine if odds of prior exposure/risk factor differ.
QUESTIONS AND CORRECT ANSWERS GRADED A+
(REAL EXAM)
What does a higher number in 1/ARR indicate?
Safer exposure.
What is 1/AR?
Case fatality rate: % of deaths occurring among those with disease.
How is case fatality rate calculated?
Deaths/cases * 100.
What is mortality rate?
# of deaths within a population within a defined period.
How is mortality rate calculated?
Deaths/total people.
What is attack rate?
Proportion of exposed people who become ill.
How is attack rate calculated?
,People who become ill/total people exposed.
What is demographic transition?
As a country proceeds to higher levels of development, birth and mortality rates decline to varying
degrees, changing the age composition of the population.
What are the characteristics of a growing population?
Short life expectancy, increasing mortality rate, increasing birth rate.
What are the characteristics of a stable population?
Long life expectancy, low mortality rate, low birth rate.
What are the characteristics of a declining population?
Long life expectancy, low mortality rate, really low birth rate.
What is likelihood ratio?
Probability of + result in patient with disorder/Probability of + result in patient without disorder =
sensitivity/1-specificity = TP rate/FP rate.
How is the likelihood ratio for a negative result calculated?
Probability of - result in patient with disorder/Probability of - result in patient without disorder = 1-
sensitivity/specificity = FN rate/TN rate.
, What is a Kaplan-Meier curve used for?
To display time-to-event data, often used to examine mortality.
What is survival probability?
1 - event probability.
What factors affect PPV and NPV in the evaluation of diagnostic tests?
Disease prevalence in the population being tested.
What is test efficiency?
(TP+TN)/(TP+FN+FP+TN).
What is a case series?
Description of clinical findings/symptoms for several patients with the same diagnosis, treatment, or
outcome.
What is a cross-sectional study?
Assesses the frequency of disease and risk-related factors in the present.
What is a case-control study?
Retrospectively compares a group of people with a disease to a group without the disease to
determine if odds of prior exposure/risk factor differ.
