NSG 3480 Exam 2 Community Health Nursing |
Questions and Correct Answers plus Rationale |
Fall, New 2026-2027 Update | Graded A+
1. Which of the following best defines epidemiology according to community
health nursing practice?
A) The study of how diseases are treated in clinical settings
B) The study of the distribution and determinants of health and disease in human
populations
C) The study of individual patient responses to medication
D) The study of healthcare system financing and administration
Correct Answer: The study of the distribution and determinants of health and
disease in human populations
Rationale: Epidemiology is the study of the distribution and determinants of
health and disease in human populations. It provides the scientific foundation for
community health nursing by identifying patterns, causes, and risk factors of
health problems. Clinical treatment and healthcare administration are not the
focus of epidemiology.
2. What are the three elements of the epidemiological triangle?
A) Person, place, and time
B) Incidence, prevalence, and mortality
C) Agent, host, and environment
D) Primary, secondary, and tertiary
Correct Answer: Agent, host, and environment
Rationale: The epidemiological triangle consists of three elements: agent (the
actual cause of disease), host (the carrier of disease), and environment (any
outside factors). Person, place, and time are components of descriptive
epidemiology, not the triangle itself.
, 3. According to the epidemiological triangle, which component represents the
actual cause of disease?
A) Host
B) Agent
C) Environment
D) Vector
Correct Answer: Agent
Rationale: In the epidemiological triangle, the agent is the actual cause of disease.
The agent can be biological, chemical, or physical in nature. The host is the carrier
of disease, and the environment includes any outside factors that influence
disease transmission.
4. Which model of disease causation is most useful for analyzing complex
chronic conditions and identifying factors amenable to nursing
intervention?
A) Epidemiological triangle
B) Wheel model
C) Web of causation
D) Germ theory
Correct Answer: Wheel model
Rationale: The wheel model subscribes to multiple-causation disease theory and
is more useful for analyzing complex chronic conditions and identifying factors
that are amenable to nursing intervention. The web of causation is better at
showing relationships among variables, while the triangle is simpler.
5. What is the primary difference between incidence rate and prevalence
rate?
A) Incidence measures new cases; prevalence measures all existing cases
B) Incidence measures all cases; prevalence measures new cases only
C) Incidence measures mortality; prevalence measures morbidity
D) Incidence measures disease severity; prevalence measures disease duration
,Correct Answer: Incidence measures new cases; prevalence measures all existing
cases
Rationale: Incidence rates describe the occurrence of new cases of a disease or
condition in a community. Prevalence rate is the number of all cases of a specific
disease or condition in a population at a given point in time. Incidence reflects
risk, while prevalence reflects the total disease burden.
6. A community health nurse is comparing local health data with data from
other cities, counties, and the nation. This process is best described as:
A) Risk assessment
B) Meaningful comparison
C) Epidemiological surveillance
D) Community diagnosis
Correct Answer: Meaningful comparison
Rationale: The community nurse compares data with rates from other cities,
counties, districts, or states, from the nation, and from previous records to show
trends. This meaningful comparison helps identify whether local health problems
are above or below expected levels.
7. What is the definition of risk in epidemiological terms?
A) The total number of deaths from a disease
B) The probability of an adverse event
C) The number of existing cases of a disease
D) The severity of a disease condition
Correct Answer: The probability of an adverse event
Rationale: Risk is defined as the probability of an adverse event. It quantifies the
likelihood that a person will develop a disease or experience a negative health
outcome. This is distinct from incidence (new cases) or prevalence (existing cases).
8. Which type of epidemiology focuses on the amount and distribution of
health and health problems within a population?
A) Analytic epidemiology
B) Descriptive epidemiology
, C) Clinical epidemiology
D) Experimental epidemiology
Correct Answer: Descriptive epidemiology
Rationale: Descriptive epidemiology focuses on the amount and distribution of
health and health problems within a population. It examines person, place, and
time factors. Analytic epidemiology, by contrast, investigates the causes of disease
by determining why a disease rate is different in one population group than in
another.
9. What is the primary focus of analytic epidemiology?
A) Describing the distribution of disease in populations
B) Investigating the causes of disease by determining why a disease rate is
different in one group than another
C) Tracking the occurrence of new cases over time
D) Measuring the total burden of disease in a community
Correct Answer: Investigating the causes of disease by determining why a disease
rate is different in one group than another
Rationale: Analytic epidemiology investigates the causes of disease by
determining why a disease rate is different in one population group than in
another. It uses observational and experimental study designs to test hypotheses
about disease causation. Descriptive epidemiology focuses on distribution.
10.What is the primary purpose of the web of causation model in
epidemiology?
A) To illustrate the complexity of relationships among causal variables of diseases
B) To provide a simple linear model of disease causation
C) To focus exclusively on the agent as the cause of disease
D) To replace the epidemiological triangle in modern practice
Correct Answer: To illustrate the complexity of relationships among causal
variables of diseases
Rationale: The web of causation model illustrates the complexity of relationships
among causal variables of diseases. It is better at showing the relationships among
Questions and Correct Answers plus Rationale |
Fall, New 2026-2027 Update | Graded A+
1. Which of the following best defines epidemiology according to community
health nursing practice?
A) The study of how diseases are treated in clinical settings
B) The study of the distribution and determinants of health and disease in human
populations
C) The study of individual patient responses to medication
D) The study of healthcare system financing and administration
Correct Answer: The study of the distribution and determinants of health and
disease in human populations
Rationale: Epidemiology is the study of the distribution and determinants of
health and disease in human populations. It provides the scientific foundation for
community health nursing by identifying patterns, causes, and risk factors of
health problems. Clinical treatment and healthcare administration are not the
focus of epidemiology.
2. What are the three elements of the epidemiological triangle?
A) Person, place, and time
B) Incidence, prevalence, and mortality
C) Agent, host, and environment
D) Primary, secondary, and tertiary
Correct Answer: Agent, host, and environment
Rationale: The epidemiological triangle consists of three elements: agent (the
actual cause of disease), host (the carrier of disease), and environment (any
outside factors). Person, place, and time are components of descriptive
epidemiology, not the triangle itself.
, 3. According to the epidemiological triangle, which component represents the
actual cause of disease?
A) Host
B) Agent
C) Environment
D) Vector
Correct Answer: Agent
Rationale: In the epidemiological triangle, the agent is the actual cause of disease.
The agent can be biological, chemical, or physical in nature. The host is the carrier
of disease, and the environment includes any outside factors that influence
disease transmission.
4. Which model of disease causation is most useful for analyzing complex
chronic conditions and identifying factors amenable to nursing
intervention?
A) Epidemiological triangle
B) Wheel model
C) Web of causation
D) Germ theory
Correct Answer: Wheel model
Rationale: The wheel model subscribes to multiple-causation disease theory and
is more useful for analyzing complex chronic conditions and identifying factors
that are amenable to nursing intervention. The web of causation is better at
showing relationships among variables, while the triangle is simpler.
5. What is the primary difference between incidence rate and prevalence
rate?
A) Incidence measures new cases; prevalence measures all existing cases
B) Incidence measures all cases; prevalence measures new cases only
C) Incidence measures mortality; prevalence measures morbidity
D) Incidence measures disease severity; prevalence measures disease duration
,Correct Answer: Incidence measures new cases; prevalence measures all existing
cases
Rationale: Incidence rates describe the occurrence of new cases of a disease or
condition in a community. Prevalence rate is the number of all cases of a specific
disease or condition in a population at a given point in time. Incidence reflects
risk, while prevalence reflects the total disease burden.
6. A community health nurse is comparing local health data with data from
other cities, counties, and the nation. This process is best described as:
A) Risk assessment
B) Meaningful comparison
C) Epidemiological surveillance
D) Community diagnosis
Correct Answer: Meaningful comparison
Rationale: The community nurse compares data with rates from other cities,
counties, districts, or states, from the nation, and from previous records to show
trends. This meaningful comparison helps identify whether local health problems
are above or below expected levels.
7. What is the definition of risk in epidemiological terms?
A) The total number of deaths from a disease
B) The probability of an adverse event
C) The number of existing cases of a disease
D) The severity of a disease condition
Correct Answer: The probability of an adverse event
Rationale: Risk is defined as the probability of an adverse event. It quantifies the
likelihood that a person will develop a disease or experience a negative health
outcome. This is distinct from incidence (new cases) or prevalence (existing cases).
8. Which type of epidemiology focuses on the amount and distribution of
health and health problems within a population?
A) Analytic epidemiology
B) Descriptive epidemiology
, C) Clinical epidemiology
D) Experimental epidemiology
Correct Answer: Descriptive epidemiology
Rationale: Descriptive epidemiology focuses on the amount and distribution of
health and health problems within a population. It examines person, place, and
time factors. Analytic epidemiology, by contrast, investigates the causes of disease
by determining why a disease rate is different in one population group than in
another.
9. What is the primary focus of analytic epidemiology?
A) Describing the distribution of disease in populations
B) Investigating the causes of disease by determining why a disease rate is
different in one group than another
C) Tracking the occurrence of new cases over time
D) Measuring the total burden of disease in a community
Correct Answer: Investigating the causes of disease by determining why a disease
rate is different in one group than another
Rationale: Analytic epidemiology investigates the causes of disease by
determining why a disease rate is different in one population group than in
another. It uses observational and experimental study designs to test hypotheses
about disease causation. Descriptive epidemiology focuses on distribution.
10.What is the primary purpose of the web of causation model in
epidemiology?
A) To illustrate the complexity of relationships among causal variables of diseases
B) To provide a simple linear model of disease causation
C) To focus exclusively on the agent as the cause of disease
D) To replace the epidemiological triangle in modern practice
Correct Answer: To illustrate the complexity of relationships among causal
variables of diseases
Rationale: The web of causation model illustrates the complexity of relationships
among causal variables of diseases. It is better at showing the relationships among
